Prop selection and preference is a personal thing and what seems great to me may seem terrible to you.

If you want to experiment, that's fine and it can be fun. But, if you're happy with the performance of your current combination, there is no "need" to change anything.

The 10x8 and 11x6 will put a similar load on the engine. You'll probably get slightly less RPM with the 11x6 but should gain some static thrust.

What this truly means will only be known when you fly the plane and see which one YOU like better.

Most 10 and 11 inch props cost under 4 dollars so the cash required to do some testing is not huge.