Blue, you want ideal performance at both ends of the speed range, which happens to be a very speed range for a model.
Ain't gonna happen with a fixed shape.
You have to make the decision... fly very fast very well, land fast, or fly very fast kinda well, land slower.
If I could handle fast airplanes, I'd go for the former, and only fly where a high landing speed can be used.
Look at full-scales... notably the Tomahawk, or even a JDAM. Or an MD-80. What wings there are are so tiny relative to what might be expected you gotta wonder.. But consider the conditions.
Neither the Tomahawk or JDAM have to land at all. The wing/stabliziing strakes work at one speed.
The MD-80 "wings" fall apart for landing.. all those slats and flaps. There's the compromise between good high speed performance and acceptable landing performance.
Don't land at all... Tomahawk. Minimum possible wing, flies very fast.
Have to land (Getting there at all is half the fun of airline flying), so the wing gets fancy, MD-80.
You want both ends of the spectrum without compromise. Well, you can't have them!