I agree with everyone here, the f6f can outperform the p47D11 easily.
Take it up to 25-30 kft and check again. The jug is optimized for high alt escort, while the F6F was optimized to Naval operations that rarely gets as high, especially against the Japanese. The arena conditions typically favor the low alt planes, but try this matchup in organized large scale scenarios. The high alt and faster planes rule those engagements.
At mid-alts, the jug still holds a good speed advantage and roll advantage. It means that you can disengage at will - not as heroic, but you can at least try a few moves before realizing that you can/cannot win and act accordingly. The opposite, for the f6f, disengaging is near impossible.
F6F and P47 is an interesting matchup - the planes were built at about the same time, meaning the same available technology. The engine is similar, the design concept is similar and the main deferences are due to optimizations. The jug was fitted with supercharger (actually built around it) and optimized for speed at very high alt, while the F6F did not requires 400+ speeds, or high-alt performance against the zeros, but did require much better low speed handling for carrier operations. Both planes proved to be a huge success in their intended roles. The major shortcoming of the jug was its range, not its performance in combat.