I found that if the bolts holding the blades are too loose then the rotational acceleration would pivot the blades backwards and set up a bad instability. If you say that it stops shaking after 1/3 throttle then this is most likely the issue as centripetal force eventually pulls out the blades to make them in line with the head brace again. I had this happen when I upgraded the motor and found it had so much acceleration that it pivoted the blades backwards. After tightening the bolts all was ok with the shakes.

To check if this is what is happening increase the throttle the same way you have been but before you get light on the skids slowly decrease the throttle back to zero and look to see if the blades are straight out any more. If they have twisted backwards from the pivot point then straighten them back out and tighten the screws. Should be a straight line from tip to tip.

As jbalat says, get the tracking and pitch right as well. And definitely spend some serious time using FMS. Helped me enormously.

Next time you go for the hover give the throttle a more rapid increase to pop the heli off the ground (once you have the screws tightened) rather than slowly easing it off the ground. Also give a bit of right aileron input as it comes off the ground and then ease off a bit on the right aileron once you are over a foot off the ground. It will naturally float about a foot off the ground provided you haven't given it too much power. Ground effect creates a compressed pocket of air at this height. Also gives the tail a more dense region of air to blow against so you end up with more left drift at this height.

Once you get used to reacting to it's need to drift around you will get a feel for where you have a tendency to hold the stick most of the time. If you find that the ail/ele stick is mostly forward/right then increase the trim settings up and right (after you land) till you find that the stick is mostly centered in a hover. You will always find that right trim is required on CW rotating heli's. All DF heli's are tail heavy unless you construct a different battery mount that is further forward so most likely you will need forward trim on the elevator.

If you sense an impending collision with the wall ease off the throttle to get it down rapidly but don't slam the throttle down quickly. I did this a number of times and busted up the skid struts on the ground impact.

Hope that helps.