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Oh, you might want to rethink your view on HP at atlitude,
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I just compare P47D and fw190A8 at sea level.
If we compare the data at 7000m altitude, P47D has more advantage because fw190a8 lose a lot of engine output there while P47D is still 2000-2300HP.
Furthermore, the air density is only 1/2-1/3 of sea level, and aircrafts should maintain a longer time at high speed above Vmax. It's more easy to dive to a high Mach number where the 4-blade propeller has efficiency advantage.
BTW, german broad chord 3-blade propeller loses 8% efficiency at Vmax compared with old 3-blade. Therefore, allied 4-blade prop should has more efficiency than german new wide blades. not 80% vs 80%, that's sth. 85% vs 75% at Vmax.
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From the A-8 on, Fw 190s could be fitted with a new paddle-bladed wooden propeller, easily identified by its wide blades with curved tips.
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To sum up, at 7000m, a high speed diving P47D is more dreadful than at sea level.