RE: A better braking prop..
I've seen similar planes with the same engine brake much better on a downline ... much better.
I've heard several people mention that vertain brand/size of props brake better. The APC 18x6W is a heavy heavy prop.
I've got more than enough vertical I could trade a lot of vertical away for downline braking. My extra weighs in right at 12 pounds and since I"m not hovering I've got plenty of power.
I've got an Irvine 1.50 with a Menz 18x6 on another extra that brakes a lot better. I'm gonna throw the menz on the extra and see what it does - thought someone might could mention another brand of props I'm not familiar with - buying $45.00 carbon props isn't a problem as long as it's gonna be a prop I'll use.