I used to be 5' 11.5" but have been 5' 10" since sometime in my 50's.
In the past I've attempted both the 34 and 17L AIWB. I didn't care for either in that carry. 17 length is my upper limit and I'd prefer 19 length. I prefer to carry lower to the beltline than many and doing so, have not seen any big issue of tilting/stability from carrying a 26 in a 26 length holster. If I carry a shorter gun in a longer holster it's cause I'm too cheap to buy the shorter holster when I have a size up that fits.
I don't prioritize how the muzzle is oriented when the gun is secured in a quality kydex holster. That measure seems to usually depend on the muzzle orientation in some static position. Standing or seated upright for example.
Get to moving, bending, crouching, twisting, being in a car wreck and by my figurin' that can vary anyway . Which is true of almost any carry.
I carry IWB at 3:30 far more than anywhere else. I've found the same IWB insofar as short guns in short holster or long holster if the carry is deeper relative to the belt line.