What is causing noise/vibration high power input on right hand (drive side) crank?
I've occasionally had this when the drive side axle was slipping in the drop out. When enough torque was applied to the pedals the axle moved just enough that the front of the tyre was rubbing on the inside of the left chain stay.

You could check the paint there and see if there is any evidence of rubbing. If this is the problem, a chain tug would solve it.

Also, how close are your brakes to the rims? Maybe a bit of flex is enough to cause the brake to rub.