I do not know for sure, but I do not think replacing an Evolution 46 with a Super Tigre 45 will generate much of a performance difference.

The Super Tigre 51 ($84.99) is on backorder at Tower. You might find one on the shelf at a LHS.

Horizon claims the Evolution 46 will spin a 11x6 prop at 12,500. If true, I think the 10x5 and 10x6 you have been using are too small. A 10x8 or 10x9 would load the engine similar to a 11x6.