I had read when the Gen5 came out that that was the case.
Oddly enough, I always thought that I would like my Gen2, and Gen 2.5 Glocks to have less blocky grips. Yet the 43 felt squirrelly in my hand, and surprisingly, so did this 26 Gen5. It's hard to explain. It's not that I have a big hand...it's that wrapping my hand around the smaller grip left too much dead space for some reason, regardless of how I squeezed. (My hands are not weak, I work on them, plus deadlift etc.)
I put the medium backstrap on and that was better, so I figured let me see what it felt like if I tried the large. The large went back to throwing off pointing and balance...though it wasn't uncomfortable. So, the medium it is.
I'm working on desensitizing the area by carrying the gun in my hand a lot around the house, (empty of course), and some exercises I learned after my injury specifically tailored toward desensitizing nerve damage in the hand that leaves it somewhat hypersensitive in areas.
Thanks, @GAP.