I ordered a couple of 15x4W props after Sundays flight. There was almost no wind except for a very slight breeze and the evolution 1.00 and a 14x6 was pretty much ballistic.
It was almost impossible to find a good throttle setting. Half throttle was WAY too much, 1/4 throttle was ok but geeze, I was either at 1/4 - 1/3 or idle with very little room to make adjustments. Either I was accelerating or I was at idle.

I also noticed too much acceleration in downlines - it didn't want to slow down, so hoping the bigger diameter prop will help with braking. The engine was running "Ok" due to the cold weather, not great- but ok. Even though, vertical performance was again, like a rocket.

We'll see if the 15x4W does what I want.