I carried a Kahr PM9 every day for three and a half years. (That was before the CM9 was available.)
If you prefer pocket carry, I can think of nothing better.
The Rohrbaugh is a jewel, but they specifically caution against +p ammo. Any short barrel pistol gives up a good bit of velocity...using +p gets some of that back. My PM9 went through a fair number of 127 gr +p+ Rangers without issue.
The G26 is just too fat for pocket carry IME. "Small/Tiny" does not apply to any Glock. If you are going to carry IWB, you can make a Glock work, but if you are going to carry IWB, a G19 is a better choice.
You stated that you are slender--any double stack will be a challenge. At least it was for me, which is why I gave up on double stacks several years ago. I can carry a 1911 more comfortably than any double-stack, and more importantly, I shoot one better and have more confidence in the cartridge.
Note--an important interim step (for me) was a Kahr P45, which is about the size of a P9 but holds 6+1 .45 acp rounds. It was my daily companion for a year and a half, until I worked out the details on carrying a 1911.
PS--Neither the PM9 or the P45 is going anywhere.

I still carry each from time to time, especially when my 55-year old back acts up.