don't forget too that since your great at rails going to a box is much different. I assume that you can angle and edge your board to stop sliding off one side or the other of the rail. if you take that to a box this will cause you to slip out. I think aim or lining up the ollie is more important on boxes too. again new park rider but some thoughts.
Thats exactly what I did, tried to manoeuvre my board to slide around on the box but it slid out.