20 tabling is pure insanity. I won't play more than 6 FR tables because any more than that I go on auto-robotic mode and I fail to look at stack sizes and other fundamental bullshit.

But hey, if you want to grow as a player, playing more hands is obvious but not at the expense of stunting your growth. Put more study time in. Review your sessions like a mad man, no excuses. Opinions may vary, but if you're not really improving much, splitting your play and study time at 50/50 wouldn't be a bad idea.