That's a good question but somewhat hard to answer. Sometimes other bolt on's can create lean spots in the part throttle map. Sometimes an engine can have one cylinder fill more efficiently than another whether it be a difference in intake/exhaust runner design, head port configuration, the amount of carbon built up on one piston.... Most respectable tuning systems have single injector compensation where you can increase the duty cyle of one injector to compensate for single cylinder lean issues.

Emanage may not solve the problem since part throttle is in closed loop and any changes made with Emanage will eventually get altered by the factory ecu. EMS or Hondata Kpro and a good tuner would solve this problem.

I've also seen cases where the fuel pump screen was clogged with sediment. You may want to check that and possibly the boost dependent FPR supplied by CT. Make sure the diaphram is still sealing. Check the vacuum lines to and from it as well.

I'd say if you can't find a dynapack anywhere near you. Buy a Wideband O2 sensor from PLX, AEM, Innovate, Zeitronix and check your part throttle yourself. Some of these come with datalogging features that could be helpful.

I know I'm all over the place with ideas. Hope it's just bad gas