Originally posted by Oleg
In neutral, for example? 
High-speed handling is all about compression. If you can perform high speed maneuvers with "main" control surfaces w/o trim adjusting then your plane has good handling at high speed, if you need to adjust your trim - your plane has bad handling at high speed. Easy enough, huh?
In RL all high-speed handling test performed w/o trim adjusting, i believe. So you cannt make your tests with combat trims on and compare it with RL tests.
But if your point about combat trim realizations only, then ok, i can agree with you. It dont means F6F5's trims are wrong, nevertheless. M.b. they actually was more effective than usual due some reasons, i dont know.
High-speed handling isn't exclusively related to compression. It is also related to mechanical power advantage of the aircraft controls to displace surfaces when under high aero forces. For example, the A6M series suffered from a lack of rolling ability due to the a lack of mechanical advantage and high aileron forces. This had nothing to do with compression. Bf 109s suffered from high control forces at speeds well below that where compression was an issue.
Test reports I've read indicated that aircraft were trimmed as required. Neutral trim will result in a pitch-up condition at high speeds for the real F6F because of wing and tailplane incidence.
In the game, you can trim nose full down and actually improve F6F high-speed handling a bit by reducing the tendency to pitch up, but this is not beneficial below 550 mph.
Some aircraft require more trim adjustment over the full speed range than others. Hellcats require very little. Ki-84s require a lot. If planes were perfectly well balanced over the entire speed range, they would not need tabs. However, all designs are a compromise. Indeed, the primary purpose of the tabs if to reduce the labor of flying by minimizing the forces operating against the pilot's controls. A properly trimmed aircraft generates less drag and greatly reduces pilot workload.
Within the game, Combat trim works very well, except at the extreme ends of the speed envelope. Most planes see no measureable gain trimming manually at very low speeds. Virtually all will see an improvement by trimming manually at high speeds, some more than others. In this case, the F6F probably benefits the least by manual trimming.
My regards,
Widewing