Gen4 Glock 23 may solve your problems. No trick to run 9mm conversion in it, and magazine release is reversible. This will allow you to drop the magazine with your index or middle finger, which many find requires less grip shift than the usual right thumb technique. However, since Gen4 has a larger mag release than its predecessors, try it the regular way before you switch: that may solve your grip shifting problem by itself.
Am presently testing a Glock 32 Gen4 for one of the gun magazines -- same gun as the G23 Gen4, but in .357 SIG -- and it's rock-solid reliable so far.