If I wear my G19 in my CTAC at 3 o'clock (right handed), all is pretty much ok. I may need to adjust the angle, possibly switch the leather tabs for better comfort though (I use the standard tab set-up at full cant).
I have recently tried using this set-up at around 3:30-4 o'clock, basically because it seemed to conceal better when viewed from the front. The butt would stick out more, but that was easy to overcome by how one bends over. The problem is it makes my lower right back ache!
I can't carry at work (teacher), so I usually only carry on the weekends. During the week, once at home we usually stay here. So it's the weekends when we go shopping, out to eat, etc. I say this because this is when I carry and drive. It's comfortable enough when sitting, but over time I think it must be stressing the muscles and I'll feel it later in the day. Take the gun out, it will still occur because the holster is still pressing up against my back and the seat.
The answer may be to just go back to 3 o'clock, but even then it can cause some discomfort. Could it simply be the weight? Anyone else experience back pain? I would imagine LEO's may have some insight because of the weight they carry. Then again, I am an avid hiker and carry much more weight on my hips with no issues (although, it's centered weight). I'm 5'8" and around 155 lbs, and while I have a little weight I could lose, I'm certainly not out of shape.
Maybe the CTAC users have some hints on their clip positions (ex-front clip at bottom hole) and belt locations. Also if you switched the leather tabs.
Thanks for any insight and help!