Fuel to air ratio is less than 1/2 the battle when it comes to getting properly tuned. Plus, its really scary and downright unsafe ot tune your car solely based on the plugs or how it sounds... you'll kick yourself later if you do. (reading Plugs is 100% necessary to tune your car, but setting the fuel up should be done with a wideband at minimum). Ignition timing is where the power is made... but you can't tune that without some form of standalone and dyno time. Definitely consider a standalone or a modified honda setup such as uberdata/crome/hondata or my personal favorite, NepTune.