But you outnumbered the Rooks, too. You guys were 2:1 against Rooks.
Bishops are penalized against both Knits and Rooks, and Knits are penalized against Rooks.
Since the Rooks are the puniest, they receive the largest advantages. You say you are penalized, but to the Bishops, which judging by the perk multiplier you posted, would be only about 0.3, you guys are a lot better off in collecting perks.
What is so wrong, or is so hard to understand about such a simple system?