I find the G26 too bulky to carry IWB. Will the Kahr P9 be any different?
Yes, the thinness will make a big difference. I have a G26 and a Kahr CM9 and the difference in thickness is very noticeable. The Kahr is much easier to carry. That being said I would not give up my G26, and prefer it most of the time due to reliability and capacity in comparison to the Kahr. I can carry a spare G19 magazine and have an additional 15 rounds available for my G26.