Mike,
A good question. Like yourself, I stopped doing kegals as soon as day continence established itself. I never gave it another thought since - as I felt kegals were just for the prevention of incontinence, and since I established good performance from my Neo early on – kegals became much less of a priority for me. Also like yourself, I mostly sit down when voiding - except when out and about in public places. I feel that when in sitting position, voiding is a little easier to do and also easier to completely empty my Neo. In my experience, mostly it is easy to void quickly and to a lesser extent, sometimes more difficult. I do find a full Neo is much easier to completely void than a half full one. There are times also, regardless of sitting or standing that pressure seems low and flow is in stages.
Perhaps practicing kegals again would address the times when the Neo is not emptying as good as it could be. It’s worth a try...