If youre going to go down, might as well go straight to the 27. The difference between the 23 and 22 isnt worth the effort.
I have 17's, 19's, and 26's, and carry a 17 and 26 daily. The 19's really arent that much smaller than the 17's, and they are big enough they wont go where the 26 will go.
While the 19's grip is better now that they redid the front strap and removed the mag ripping hole, its still somewhat cramped in my hands. The 17's give a full grip, and the 26's allow you to wrap your pinkie under it and get a comfortable grip. The 19 is right in the middle, and my pinkie is still in a bad spot.
Dont give up on the 27 just by a casual feel in the gun shop. The smaller Glocks are amazing guns, and once you get used to them, and I think you'll be amazed at how well you can shoot them. I shoot my 26's just as well as my 17's and 19's.
You dont need the mag extensions either. Once you get used to your pinkie wrapped underneath, you'll see they are not needed. I tried them early on, and quickly learned they are more of a detriment than a help. They make the gun unnecessarily bigger, and pinch you hands, both while shooting, and especially during a reload, if you arent careful.