Jordysimo.... Im in a similar position to yourself. im 3 months out from my reversal, and like you things are fairly good with regards to frequency (5 times a day ..ish, but i wake 1 or 2 times a night)
i dont really have urgency (i mean i can hold for hours), but i do feel like i always need to go to the bathroom. For example i have just been to the bathroom, its feels as if i need to go again already, but i know i will be fine for another 5 or 6 hours at least... but the sensation is always there...nagging at me and this does get me down a bit too.
It makes me feel like i cant squat down or bend over, even though ive not had any problems. Occasionally i get a twinge that feels like urgency, but then passes. I know the more frequently i get those twinges, the more urgent the situation is.
I know if i hold too long, something strange happens, perhaps the pouch overfills or something. I can empty the pouch but shortly after (10 or 20 mins) i get a feeling of urgency which i think is the pouch refilling (presumably its the food that was held higher up the pouch that i couldn't move by straining) but again i can hold if required.
The point is im constantly reminded of my need for the bathroom, i console myself that im doing good, but i can sympathize and relate to what your are saying. I hope that the 'nagging' will ease in the coming months as 3 months is quite soon.
Regarding emptying, i find what going on all 4s and sticking your bum in the air, or leaning backwards towards teh tank of the toilet while seated does help. The kegels sounds like a good idea... i will try that. Failing that dip your rear end in warm water or lean against a radiator.