OK, per suggestions here, I let the amp run continuous for about 48hrs. If you add in my listening hours, the total time would be somewhere about 55hrs. There is very little change in the sound. The bass is still there, mids are nice, but the top end is still shelved (maybe a tad less than before the 48hrs of run time). It sounds akin to listening to the rolled top end of Mullard tube. I'm sure a lot of people would like this presentation. I'm just missing top end details, presence, and bite (when the music calls for it). All of this top end characteristic was present with the stock cap. I'll try to use a smaller film cap in parallel and see what happens. I like the bass and the mids enough with the Mundorf to continue experimenting to see if I can find the right overall compromise.