"Nick,
There is no such thing
"Nick,
There is no such thing as getting too much fuel, since this engine siphon via a vacuum system base on what is needs not a electronic pump forcing the fuel as you think hence carb system.
You can keep the questions coming until hell freezes over and guys like me will keep posting
You need to understand all of us are trying to give you an honest opinion.
It can only be honest base on the all the facts you reported.
Yes you now mentioned the fact the thermostats are removed.
Evinrude after years of feedback change the even the plugs they ship the units with because of an running rich issue reported
Point is you have to be patient and approach this one at a time since a plug loads up for a number of different reasons.
First and foremost install the thermostats period.
Secondly you mentioned the GAP at .35 what brand of plugs are you running ?
For example if you change from Champion plus to NGK .35 will show up on the temperature gauge at a 5 degrees hotter.
My point is your solution will be much faster if you provide all the details upfront.
You can simply start by using NGK Plugs gap at 35 with the recommend thermostats installed and test.
Don't go hooking up the VRO just yet since you will have another 20 post instructing you how this is done correctly testing the warning horn etc.
Keep it simple by doing one thing at a time and simple solutions will be sure to follow. As I have always said “we are not sending a man to the moon” just fixing and device that needs a good fuel to air ratio and good spark and you can fish for a life time!"