I've been thinkin on the reasoning for drilling the hole in the thermostat and I come up blank.
All of the engines I've run in mine including now the 1200, run cool or mid gauge around town slow riding with stop and go when it's 100-105 outside.
When temp gets to 3/4 scale, fan comes on then cools down as it should.
I see nothing wrong with the system as it's designed.
Seems to me if you're having to get more flow to keep temps down then something else may not be working as it should, like not good flow through the radiator. I mean flow through a radiator can appear okay when flushing through it, but it may not be flowing through all the tubes so heat is removed fast enough as it should.
Maybe by drilling the hole you'll find a "sweet spot" for say, summer riding in 90+ temps but then in cooler weather it won't be a sweet spot anymore, too cool. That is why a thermostat does what it does, to control the temp in all weather.
On the flip side, if flow is too fast through the radiator then there isn't enough time for the radiator to cool the water. I have tried mine without a thermostat which makes temps run noticeably higher.