it is very true that alot depends on the year and which girls come. But, at the same time, seminaries like bnos chava, BJJ, bnos sara, hadar… that have been around for a while are pretty much going to get a certain type every year. It might vary a little but not so drasticly. It’s always a risk, but not as much as going to a new seminary.
I dont know much about Mesores Rochel- I dont know anyone there. I’ve heard that its very intense academicly, and it seems to center around Rebetzin Tarshish.
Either way, it sounds like you’ve narrowed it down to three to apply to. That’s all of the decision you need for now… until acceptances come.
Hatzlocha rabah!