So here's the deal. I moved up to NL50 a month a go (when I had 40 BI for that), went on a sick heater and now I have 40 BI for NL100. The problem is I'm not confident whether I'm good enough for NL100.

Right now I usually select few of the juiciest NL100 tables and fill the rest up with NL50 (I play 4-5 SH tables at the time). Is that OK or should I just concentrate on one limit? What about the variance. Has playing 2 NL100 tables + 2 NL50 tables the same average variance as playing 4 NL75 (hypothetical) tables? Thanks for your thoughts.