Multi-Table Growing Pains?

[TryTight]

Three weeks ago I moved from 2-3 tables at a time to 4-5. (Even bought a 2nd large LCD) I know I'm not giving a large sample size and it could completely be variance, but I am on a huge downward swing. Did anyone else experience this? Is it growing pains or am I not ready?
For the past 3 days I moved back down to 2-3 games and returned to my previous rates. (roughly 37% ITM, 13%ROI)