Hard to argue with any point of Steve's response, above (not that I'd want to).
I'd add that a Glock model 23 magazine and an aftermarket adapter sleeve which slips over the mag and extends the grip of your G27 to G23 length, may give you the control advantages and most of the "feel" of the larger G23, at a fraction of the cost. Unless you get a chance to fire a G23 side-by-side with the G27, you may be surprised to find that the G23 does not kick all that much less (if any; some swear it kicks more).
However, after you apply Steve's remedies, I'd say that the G26 might be a good choice anyway. The less expensive ammo might allow you to shoot up to 50% more for the same amount of money, and more (quality) practice is always a good thing. Quality instruction + lighter kicking weapon + more practice = higher skill level (maybe a LOT higher).
"Placement is power" -- seen in an article by Stephen A. Camp
(RIP, Mr. Camp; you will be remembered, and missed)