Where to play 2/4 limit? Party, Absolute or UB?

[Beck]

As of now, I've played about 20.000 hands of 2/4, about half at Pokerroom clearing ther bonuses and then some some at crypto and Empire. Being the bad player that I am,I'm still in the red with about 65BB, but that's about to change (I hope...)

Anyway, once I'm done with the PR bonus, where should I start playing next?

My average rake have been $0.9 pr hand, and it seems approximately 50% of all hands are raked?

All assuming full tables:
At Empire I get 25% rakeback, which would give me $2.25/100 hands or 0.56BB/100

At Absolute I get 25% rakeback, which would give me $2.5+$5(bonus)=$7.5/100 or 1.88BB/100

At Ultimate The UB points equals a 100% rakeback, which would give me $9/100 or 2.25BB/100

Do the bad players at Party really make up nearly 2BB compared to UB? Or is my math flawed omewhere, making it evidentthat Party is the place to play?
I know I can only play 3 tables at both Absolute and UB, but that still 6 tables total.