Of couse it is an unbalanced guild. We are casual. We are not a heroic guild and dont plan on being anytime soon. The question is: Why do people choose not participate in the raid? They do TW. They do TB. They do Tank (even when we were not doing heroic). They do Rancor.
The answer is the 2 Nihilus phases are unbridled pain and not fun. I love challenging content. I like hard content. I put up my 10-20M per raid and so do others. The point is that it is difficult annoying and too protracted. They should at least fix the protracted part.
Im guessing if they showed us their secret data on all phases on all raids the participation level in P1 of sith is far worse - not by a little but by a lot - than any other raid phase. Also the amount of times the "auto" button is hit during that phase is going to be high - even for people that do participate. Again "break up your guild" solution is not just bad design, its bad for business.