I get loads of control from my forehand and backhand and my angle is just the best part
I hit with quite alot of power to?
Yeah, Knowle was a pretty cool singles player in his heyday and is still pretty good in doubles. Fabrice Santoro is probably the best example for how much one can do in terms of creating spin on slices from a two handed forehand although then again I'm not sure anyone else could pull off what he does.
You might want to experiment with trying some shots with both the single hand forehand and the two handhanded forehand. It may turn out you are more comfortable hitting some shots two handed and some shots one handed. For example, as Uranium pointed out, Monica Niculescu hits her forehand slices with one hand but most of her other forehands she hits with two hands.
most of the times I play one handed forehand. my backhand is always doublehanded except for the dropshot . I don't practice a lot with double handed both sides, so I guess that's the reason I'm not that good at it.