if non of that works, this is far fetched k but, use the multimeter and check pulse on the offending injectors wiring and reference with the good working ones see if there's a difference, that could means bad ecu or parts within, I'm not a seasoned honda ecu guy but, I think there are transistors in that ecu that control the injector pulse, and they are controled by fuel map and sensor resistance values, not sure bout these hondas having that setup in there but sometimes u can just saulder a new one in and be good to go,, some deep shit right there though, I personally hate wiring and electronix cause they're so damn easy to break but I love when I"m done messing around and its finally fixed, its a damn good feeling, hope some of this helps!