FWIW, for a while I delved into HU thinking it would help my overall game, it would be a fun divergence from full ring, AND it would help me start tables to make money and have great table selection. It looked good on paper, but I found that being a good HU player and being a good FR player are two COMPLETELY different mindsets and it's very difficult to do both successfully. In fact, I looked up several good HU players and their FR results are pretty spotty just like many good FR players have spotty HU records. I know someone will be quick to point out a handful of players who can do EVERYTHING well, BUT I don't think the number of players who have a solid HU game AND FR game is particularly high.

HU is very difficult because you are ALWAYS in the hand and can never take a hand off. You are also constantly pushing very small edges like value betting 3rd pair and the like. The variance is probably higher unless you have a nice edge over your opponent AND you log enough hands. For me, I also am MUCH, MUCH, MUCH more prone to tilt HU - I suspect this is true of most players because of the personal nature of HU.

Anyway, just responding to let you know I've been down the same road and my opinions on it and not to let losing a couple of BI frustrate you.