I know how feel Matt i have a curved spine(from sitting in my chair all the time) so im willing to bet your mount is better than mine. lol i go to mount strictly for late-match points or strikes.

These three options are pretty good:
Sitting Mount

You can also do what i do. Dont release your grip that got the mount. When you mount you usually have an arm behind the head right? so instead of going to the four point stance(both hands and both knees on the ground) just leave your hand there make sure you keep your body low, grip his gi/shoulder, apply shoulder pressure and keep a high mount. you believe how many chokes you'll lock up. It opens up wristlocks too. well wristlocks for me would be armbars for you.