We have to use the schui wet tyre over here, as its the spec wet.
I was told that sorex brought up all the old stock of the pit wets, they have enough for about 7 years apparently
They do work well though, I did always like the old 21mm wet as well.
The problem with brushed in the wet was that you could easily eat up a set of brushes in one run. As long as you take the right precautions brushless in the wet is no issue... Just don't let the sensors get wet!!!
As for the power cap, erm, that's the standard one that came with the speedo!