[serialk11r]

Forgive me if you mentioned this already, I haven't gone through this thread in a while, have you thought about ECU tuning? You're lucky you have a Honda (can use Hondata Flashpro), it's not like Toyota where you need to use piggyback or a crappy standalone like an Apexi PFC.

Right now there's a chance you're sending a little extra fuel out the tailpipe when you step harder on the throttle (from what I can find on Google images, your engine seems to activate open loop enrichment at low speeds). If you get a flash you could get rid of that. You can also add enrichment and then use a narrowband emulator to run lean and get a 5-10% boost in fuel economy. On these bigger engines it should really help a lot.