Update: Live fire at the range
I got to spend an hour at the range today and think I, for the most part, answer a lot of my question based on advice and observations above. I shot my 43x and my 1911 and PPKs for comparison, shooting around 200 rounds combined. I learned some things today, and for the most part know where I stand at the moment.
I shot the 43x with the lightest, shortest smoothest combination, and I don't think that going that light and short was much of an advantage. My 1911 by far shot the tightest groups but taught me a good lesson. I have propensity to flinch, or jerk or whatever. On two occasions I had set the safety on my 1911 and forgot to switch it off. Pulled the trigger and faked myself out and had movement. I know I've got to work on that. My 1911's groups were acceptably tight for the most part. My 43x, not as good, but even at 12 yards everything was well within an 8' target and relatively tight, but off to the left a bit consistently, but not down and to the left. I have to decide if it's me or the rear needs to be pushed a hair to the right. I don't have a pusher so I'll leave it alone until I can get hold of one.
Based on today's results, I've gone back to the OEM connector that puts back the wall and add another 3/4 pound of pull. I didn't think I benefitted from going so light. I like the reduced pre-travel of Johnny Glock's enhanced OEM trigger shoe. Feels so much better than the serrated one. I like it and have offered the Overwatch PolyDAT trigger to my buddy who now has it in his 43x.
FWIW I didn't dismiss any of the wisdom from the replies above. I needed the information to evaluate on my own to see what folks thought and see how my experience coincided or was counter to the advice. I don't think I need a bone stock pistol for EDC, but I think after a certain point, at least at my skill level and application there isn't much if any benefit from going too far outside of OEM spec. I think 4+ pounds with a bit of pre-travel reduction is about where I think I want to be right now. The OEM connector seems fine though the Ghost Pro does make things easier- but probably not desirable for my purposes at this time. More shooting and testing to come. On an interesting note, upon returning from the range and cleaning my Glock and doing 15 minutes of laser dry fire tonight, my dry fire groups tightened up a bit even from yesterday. I think it's what I learned today about flinching/jerking. I think that will be my focus for the next few days until I hit the range next week.
Thanks all for your comments.
Edit: Since this past post Johnny Glock graciously exchanged his $22 shoe (which I liked a lot) for his flat face trigger. It is currently on a OEM trigger bar with OEM connector. The only other upgrades are 4.5 pound striker spring and reduced power safety plunger spring. I like the flat face shoe much better for both comfort and control and measured on a Wheeler device I have a consistent pull of just over 4 pound with seemingly just the right amount of pre-travel and over travel. Johnny's flat face shoe only has over travel and I set it to his basic recommendation. While I had questions about what's too light, what's not, what's taken some experimentation and learning, I think I've found the happy medium. Just add training. Thanks again folks.