Seems you are running outdoors, so I guess tyre wear is quite severe. Next pointers I have for you:
Relation to tyre diameter and ride height, maybe your chassis or body is hitting the surface in the corners reducing your lateral grip.
If this is not the case, the next relation between diameter and lateral grip might be solved with changing your additive timing (prolonging I would say)... generally speaking the less tyre sidewall you have the less lateral grip... Additive timing and/or chassis setup can help a lot when your tyres wear down a bit. For outdoors, and I'm guessing here, you should be able to run your tyres down to 44mm or even lower before grip starts to fade away.
Let me know what tyres and additive you are using as I'm planning to give outdoors 12th a chance this summer!
cheers