Also, playing too many tables (pretty much proven here ^) will decrease your edge thus increasing your variance thus increasing your frustration! Which leads to tilt/spew/autopiloting, you name it. Being pissed off, making snap decisions, and not focusing isn't really a great way to learn poker. Something to note is each sample size isn't huge, but do act as a general indicator that play less tables = learn and move up smoother.

Now if only I didn't have those few mass tabling sessions at 200nl