Josh6575, I have not experience moving the CG to do a waterfall. My CG is set at per instruction book by using the a 1400 mha JR battery to balance in the front-on top of the fuel tank of the aricraft. I glued a velco on the bottom of the tank and the opposite side of the velco on the centerline tank area to aviod tank moving around. Instead, I have increased throws to 20% from 11% using 30% Expo and have beautiful waterfalls. Forknife edgeyoumay need to balance the wings precisely and add weight. Hang it upside inverted ona nonmovingpole and usethe engine shaft and centerline of the fuse endtail to balance.Be sure the two elevator halfs areprecisely equal. You can use totwo rod ends. Tape a end rodon each elevator half making a "V" point to contact each other and tigthen the collar when precisely equal. Currently, I, now, fly this Extra using APC 13X6 prop-OS 55 AX. It will not go unlimited vertical, but this setup will take the plane nearly out of sight about 700 to 800 feet up for smooth vertical up-lines. This Extra will fly like a 30% aircraft andwill perform IMAC Squence for practice entry. I'm very please with this Extra. Currently, awaiting for Great Planes to make a 60 size verison of this plane.