OVR's advice is, as usual, right on. Energy management was hard for me, too. Just hold your carves a little longer until you're a bit past perpindicular to the fall line. (Make sure you have enough room trail-wise) As soon as you start carving uphill, you'll hemorrage energy. The trick is knowing how much speed you want to dump before you start the next carve. Dump too much and you'll have to nurse the next carve because you won't have enough speed to aggressively intitiate. Dump too little and you wind up with your Mach 39 issue, gaining speed through each incomplete carve. The difference between the two is very small timing-wise. Another thing that helped was focusing on push-pull, i.e. aggressively initiate the carve and pushing at the start and then pulling or unweighting as the board passes through the fall line rather than trying to "G" your way through it. There's a good example of Billy Bordie doing this at the 9:40-10:30 point in this video:http://www.hardbooter.net/Video/size_doesnt_matter.wmv