I always got the feeling that I couldn't empty out my pouch completely and would strain quite a bit. However, when I was at a friend's house I tried out a "Squatty potty," which is basically a sort of modified foot stool that lets you use a Western toilet in a squatting position. The idea is that the puborectalis muscle, an important muscle for continence, is able to fully relax only in a squat, so sitting on a Western toilet can lead to incomplete emptying of your colon (or pouch, in our case!).
Emptying my pouch in a squatting position completely ended the straining and "full feeling" for me, and I use the restroom much less frequently now.
Although I ended up buying a squatty potty and couldn't be happier, I don't really think you need to buy one; I bet you could easily improvise with one or two footstools, or even by mimicking a "squat" position as best you can by putting your feet up.
I hope this helps someone! Anyone else have success using a similar method?
P.S. Their commercial is pretty funny, too.