Struggling choosing a disc weight.

So I’m a forehand thrower mainly due to a right knee injury. Typically I can get a 169g Insanity to fly about 200ft before sitting down, I can do so accurately and sit it right down where I want it.

That said, I’m trying to boost myself by about 50ft and I figured lighter discs would work but I struggle with shanking them or making them flip. Am I strong arming them? The lighter disc I’ve been using is also an Insanity but in 159g. I also have a Crave in 169g but it also flies about 200ft before sitting down granted accurate but still not enough distance for me.

Any ideas? Would it be better to just post a form check? Thanks guys!