Agreed on the idle speed. I might change to 10-4 or 10-6 to slow things down just a bit. That 10-8 will really move the plane. On my Explorer 40, I ran a 12 1/4 x 3 3/4 with an OS 52 four stroke. All the speed I needed, and it would really pull when you hit full throttle. I seldom flew over 3/4 throttle with it. I broke a bunch of props, usually ground them down a bit hitting the runway. When I couldn't balance them out at 11" D, then I put on a new one.

I replaced the nose landing gear wire with a Dubro gear. That cut the prop loss by a bunch. The ARF's use some mushhy wire and it was bending back a lot. The mains could have used replacing also as you could see them squash out when you touched down at anything over greasing it in. Check your langing gear for being bent. The nose gear should point straight down, no back rake to it. If you can adjust the nose gear height, give the model the most ground clearance you can. Also make sure the main wires are straight, they should point straing down when looking at the from the side. You can squeeze together to increase ground clearance. Just make sure the plane is not setting nose down or nose up when setting on a table. You want it to be perty much level.

One more thing to try when you are nearing the end of the runway, a couple weaves back and forth will cut down the ground speed some. Just watch you don't flip the plane by trying to turn to fast. Just do this and then make the turn for taxi back to pilot area.

Last, the APC props are the best in my view. The are somewhat tougher than the wood ones, but they will still break. If you buy them by the dozen, you can save some money. It worked for me.