i have here a 400 size 3500kv outrunner from my trex, and a 960mm wingspan cap232, I know some pushers run some similar kv motors with like a 4.75x4.75 prop and they scream, I wanted to try the same with the cap232..

any reason why i shouldnt and can anyone recommend any other props?

For an aerobatic plane you'd be better off to put the motor on a gearbox so you can use a bigger slow turning prop Try it in in a GWS gearbox. I use a Himax 2025 with a KV of 4200. The GWS drive is a called a C drive which is 12 teeth on the motor and 64 on the big gear. It swings a 10 to 11 in prop for lots of pulling power for vertical stuff. Hope this helps.

a GWS c drive... i will look into it, Cheers