Actually a scarecrow is somewhat easier then a Front,i only have a backroll and a scarecrow in my tricks and i can't land a ts front at all.Just take your front up the same way but as soon as you start to roll over pull that rope hard to your back hip which will turn you 180 for the Crow.I actually cant do them that way but thats proper but i hit the wake pop up throw my head and shoulder down to the wake and then drop my left(front) hand off the handle and it brings me right around to the crow.
If that wont work for you work on spins ,they ,to me ,are way harder then basic inverts.
Good luck
bill
NWA
BA Wakeboards
http://www.boardsource.net