The 43x was my first striker fire blaster and first 9mm, so I really wanted to explore it further. I've had the chance to try a few triggers and have some thoughts and preferences. The triggers I have tried are: 1) Stock Glock OEM serrated shoe. 2) Overwatch Poly DAT trigger (w/bar). 3) Johnny Glock $22 modified OEM trigger shoe. 4) Johnny Glock flat face trigger. I've had the opportunity to try them with different connectors and striker springs. I've tested these triggers with the OEM connector. Ghost Edge. Ghost Pro and Taran Tactical along with #4.5, 5.0 and stock springs. What I've found is that the components work together as a group and each has an affect on the others.
Spring tension and connector break are greatly affected by pre-travel and over travel considerations.
I'll give you the simple, cheapest and possibly the best combination, provided you like curved triggers. The Johnny Glock $22 oem shoe on a standard trigger bar, OEM connector with a 4.5 pound striker spring would be my off-the-cuff recommendation. Aside from being unbelievably cheap what the JG $22 shoe has is a pre-travel adjustment. By reeling in all that extra movement at the beginning makes for very short movements needed while still being safe. Trigger pull weight is then managed by striker springs and the connector to some degree.
If I can go on a bit about the JG $22 shoe with standard bar. I tried this with a Ghost PRO connector, adjusted for more limited overtravel. The combination of the two made for a very short pull, almost like a 1911 if you can believe it. Because of the decreased pre travel, a connector like the Ghost Pro that has a lot of roll has almost no "squishiness" that can be attributed to Ghost connectors whose claim to fame is eliminating the "bump". So it's a very short movement to the break, but it doesn't feel like a glass rod. It just feels like a break that happened smoothly without a lot of motion. I tried this combintation for awhile with the 4.5 pound spring and found the setup TOO LIGHT, close to 3 pounds and didn't help my shooting accuracy. I didn't think to put a heavier spring back in but changed the connector back to the OEM connector which works very well with this trigger.
A company previously mentioned, Overwatch Precision, their Poly DAT trigger isn't a bad alternative for around $60. I found it a bit too wide and too flat across the face and modified it to round off the "overhangs" at the edges. I felt the overhangs dug into my trigger finger a bit too much. While Overwatch claims to have removed some pre-travel, the adjustment is minimal, I think. It does work well with the OEM connector and #4.5 striker spring. Of all three after-market shoes the Poly DAT had the most pre travel, but unless you're comparing against others it is fine. It is far more comfortable than the standard Glock shoe with serrations and annoying dingus...errr.... safety level, that digs into your finger constantly reminding you that it's there. If you don't mind the width of the face and relatively sharp edges (overhangs) don't be put off by the polymer. Does the Overwatch tactical shoe have a different pre/over travel than the Poly DAT?
Johnny Glocks Flat face shoe. This is the most expensive of the three by a lot @ $105 for the shoe alone. It has reduced pre-travel, significantly more than the Overwatch Poly DAT but not as much as their $22 shoe that has pre-travel adjustment. This shoe works well with all the connectors I've tried. In fact, right now I've got the Ghost Pro connector in and found this setup with a #4.5 striker spring to make the pull too light, just over 3 pounds. I've now gone up to a pound springs and am up to 3.75 pound pull- and if I put the stock spring back in it's about #4.25. There is enough pre-travel reduction that there is only a slight "roll" before the break. But the one thing that I want to note is that with the Ghost connector is that once I feel the resistance, the amount of force to pull through to the break is constant (if squeezing slowly and progressively). I contrast that with the other connectors which seem to require an increasing amount of finger squeeze pressure until you can get it to break. I'm finding I like the smoothness of the 5 pound spring with the Ghost Pro connector and the JG flat face shoe. I'm not sure which combination I'll end up with, but I have some tactical training in the next few weeks and I'll decide what i think works best. What I'm getting at is that I've discovered that the amount of pre-travel determines how the bar interfaces with the connector which can drastically affect the trigger pull weight, which can then be made heavier or lighter with the striker spring of preference. Where this might become important for some is that if someone wants a lighter pull but is afraid of light primer strikes because of a lightweight striker spring there are ways to lighten and/or shorten the trigger pull and still use a heavier springs.
I know there are a lot of really well made, great functioning, great feeling triggers out there. There are just three that I've had experience with. Good luck.