I am happy you're doing great sofar.
I as you, struggle to empty, my pouch is very well designed, so that you don't have urgency and continence problems (and is quite large and containing), but the problem is that I developed some hemorroid because of straining to empty, as in my case is not a sensation, but really, when you are almost emptied, it misses the "push" from the weight above to out the remaining.
I think that you could find beneficial the psyllium fiber (aka Metamucil); I advise you to try it, starting cautiously (half dosage first days) and see what happens!
Perhaps it will help even to lower your bathroom trips.