If the difference is european and US classefication of landing fees is the reason for this difference in mtow , then Caranado should make it posibble to use a US setting to swap the difference between a MTOW 4407lbs and 4750 lbs. A MTOW of 4750lbs is not “technically a bit higher”. It is a substantial difference of more than 340lbs or about 2 pax. With full tanks the plane in present setting is a 3 seater, with factory setting it becomes a 5 seater.
If it was like marccreal states, 340lbs overload compared to a mtow of 4407 should not change the the flight characteristics other things beeing equal. In the sim a teoretical 300 lb overload, result in drastically increased stall speed from according to factory spec is about 60 knots to about 85 knots according to my testing.