Which OS .46 is it? That will make a difference in prop selection.

I'd try an assortment of sizes and even brands.

If it is a .46-AX or FX, I'd try an APC 11x5 and 11x6, maybe even an 11x7. I'd definitely try 10x7 or 10x8 too though.

If it is a .46-LA then You might look at going to maybe a 9" prop with a higher pitch. Something like a 9x7 or 9x8.

By trying several you will be able to zero in on the one that gives the best all around performance based on how you like the plane to fly.