Plugs fouling

I would say you have an EFI sensor problem, those MM efi systems either work spot on or are screwed up and usually it's a sensor.

There is a specific way to set things up, and any one of several sensors can cause problems.

FWIH the bike is going rich at startup, first thing I would do and this is common with older EFI bikes is change out the head temp sensor, it maybe telling the bike it's cold longer than it should so it stays in startup mode longer dumping fuel, like running with the choke open.

Sensor should be on the left side, front head behind the horn bracket, not too expensive and you can change it. Sensor may work but not be in range properly and then when the motor gets hot it works.

You have other sensors on the bike as well to be checked.

I'd toss $40 to $50 at that sensor first, it won't hurt and it might help.

As for tuning, if you have headwork, cams, exhaust filters or a combo of those a Powercommander USB is a good thing , it can increase power and fuel mileage however a good dyno tune with one is the way to go.

Welcome to Power Commander EX and Power Commander III USB

they are add on bolt on computers that "trick" the efi system and iginition into behaving differently.

You can download all kinds of maps but JMO the best is a dyno tune specific to your bike.