I have been a sig p224-p226 fan because I shoot them better than anything I've picked up. I like the idea of the glocks, but I consistently pull my shots left.
I believe pulling left is a result of too little finger on the trigger (causing you to push) and right is too much (causing you to pull). Might try adjusting where you put your finger on the trigger.
I have a Sig P220 and it is my favorite handgun for carry.
Rosewood