I think performance factor is much more important than flawless technique because its something that you cant really teach, at least not during this 10 wk show. take danica & liz for example vs amber. Danica & liz had great technique but couldnt hold a candle to amber who oozed stage presence.
So, i dont think Val is trying to be less of a technician because janel cant handle it, i think she is fairly capable technically, i think its more that he realizes that she has that performance factor, which is special, & doesnt want to dampen it by drilling her into being concerned about bing a super technician and causing her to lose her performance quality. Danica & liz didnt have much performance factor so one of the only thing val could focus & improve upon was drilling their technique.
I think janel goofing off is just trying to make val smile & relax. he has said himself multiple times that he gets super intense & focused sometimes and needs a partner that loosens him up, makes him laugh, and reminds him sometimes to relax. Sherri & zendaya were really good at that and i think janel could be too.