In many cases with speed applications, the engine is propped up to the point where it can barely turn the prop on the ground.... and initial acceleration is terrible. But as the aircraft and engine accelerate, the prop gets into a rhelm where the prop works its best. On the ground, you simply never see the prop or engine perform.
Yes, that's it!
Assuming that you have the same power available: - if you want to increase thrust you have to reduce pitch speed and vice versa.
Since we modellers don't have the privilege to change the prop pitch during flight, we have to choose a compromise depending on the actual model's flight characteristics.
That's why some EDFs with low power to weight ratio can't take-off from the ground and need a special launch catapult because they have to sacrifice thrust for the sake of speed… but once in the air they may fly nicely.
Static thrust only tells you whether your plane is able to hover, nothing more.
The key is:
power to weight ratio.
If you have the right power to weight ratio, you can get the thrust and the speed you want.