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Yes , it is IZFR7M plugs
No , the rails, injectors, direct injectors have not been cleaned or serviced
The battery's are blue top Optimas , one starting battery by itself , two trolling motor...

What else can I do ?

Forgot to say. I also changed fuel filter and gapped the plugs to .044
Primer bulb is staying hard also.

If... I had any gains , it was midrange , but again hard to tell .

SCB Topcat 22ft modified tunnel My bare hull weighed in at 1610 lbs

Serial # 1E051058 model 193247BHH DBR L1.2 kit ,

Past months history.. Started with what seemed to be a miss when I would trim the motor or operate the jackplate either one. ...

I have , L1.2 with machined flywheel , open front cowl with cover. Honestly I personally can not tell you that it made any difference. I am not saying it did not , but it was not...