If there are seperate pick ups for each engine in the tank, one might be a bit longer and therefore picking up more crap. Good luck on the fuel filters, I have been having a hard time getting some of the more common filters lately. Got a number of work boats with the Racor S3227 filters. Seems...
Haven't worked on any of newer Hondas, but I expect you will find at least one one small water seperator fuel filter on the engine. Possibly also another inline filter, and there is usually a filter or fine mesh screen in the vapor separation tank.
All the way down when hitting the throttle to come out of the hole. Then play with the trim slowly to maximize the speed while still retraining good control. Usually I trim up to point the boat starts getting a bit skittish, than back down a touch. If there is a chop, might trim down a bit more...