Hi Nick,
A few things,.....
You cannot run 12:1 CR on 94 octane fuel, twin-plug or not. Attempting to do so will cost you new P/C's (unless you are using Motec M600).
Choosing engine components is not like ordering a dinner in a restaurant (al la carte) if one expects a successful outcome. Each and every part of the whole entity must work in concert with each other and that includes factoring gearing, vehicle weight, and usage.
I employ a holistic view of modifications to the entire car so that the end result meets and exceeds the owner's expectations and requirements and that means considering the upgrade project as one entity.
An engine with a 2K powerband situated in the 5500-7500+ range MUST have close-ratio gears to perform well. Further, engine operation above 7K with these big bore motors really needs better rods as well as a whole host of oiling modifications to live.
Hope this helps,
(BTW, ATF is a SAE 7w oil; light stuff)