Backwards rolling hop and 180 rolling hop off stuff?

Hi,

I have perfected the flat 180 rolling hop to riding backwards, but I cannot 180 back around, as my feet are in a weird position. Does anyone have any tips on doing this?

Also, when I try to rolling 180 off of a curb or something, the uni shoots backwards out from under me. Any ideas why this might be?

Help would be greatly appreciated.

Austin