I'm not really that good at multitabling. I can handle 2, but usually just play one.
I'm glad you found your sweet spot. I still haven't found mine. I've played up to four tables before. When I'm alert I can manage all four. That said, 2 is easier to handle and my results are better when I have 1 tourney I'm focusing on.
The more tables you play, the more opportunities you'll have to hit your range
hands. The tradeoff, however, is that you won't realize the tendencies of the players at your table. Does Player A always fold to three bets? Does Player C fold the small blind when they're short stacked?
There are benefits and detriments to multi-tabling.