Here is something else to consider: At the Van's recommended Max Gross Weight for the RV-3B, RV-4, RV-7/7A, RV-8/8A and RV-14/14A, (and I think the RV-6/6A also) the airplane's Design Load Factor Limits are the the Utility Category Limits (+4.4/-1.75 G).
However, at the Van's recommended Max Gross Weight for the RV-9/9A and RV-10, the airplane's Design Load Factor Limits are the Normal Category Limits (+3.8, -1.5 G).
So increasing the Max Gross Weight
slightly above the Van's recommended numbers on the RV-3B, RV-4, RV-7/7A, RV-8/8A and RV-14/14A, and the RV-6/6A, gets you somewhere between the Utility Category Limits (+4.4/-1.75 G) and the Normal Category Load Factor Limits (+3.8, -1.5 G).
But increasing the Max Gross Weight above the Van's recommended numbers on the RV-9/9A and RV-10, gets you
less than the Normal Category Load Factor Limits of +3.8, -1.5 G, which is definitely not recommended for normal operations.
Ref:
https://www.vansaircraft.com/flying-an-rv/
"The RV-3B, RV-4, RV-7/7A, RV-8/8A and RV-14/14A have been designed for the operational stress limits of the aerobatic category (+6.0/-3.0 G) at and below their aerobatic gross weights. The operational stress limits for these aircraft between their aerobatic gross weights and their maximum design gross weights are utility category (+4.4/-1.75 G). The RV-9/9A, RV-10 and RV-12 are not designed for aerobatic flight.
The design operational stress limit for the RV-9/9A is utility category (+4.4/-1.75 G) at less than 1600 pound gross weight and is standard category (+3.8/-1.5 G) between 1600 pounds and the aircraft’s design gross weight. The design operational stress limit for the RV-10 is standard category (+3.8/-1.5 G).
No RV should ever be operated above its design gross weight limit."
Having said all that, I would stick with Van's recommended Max Gross Weight numbers, as they have done the design analysis, ground testing, and flight testing to validate their airplanes for all of the different design load conditions (static, dynamic, maneuver, gust, and landing).