Smoothing a 407 rotor head is really not that hard with the RADs. Been doing it for years. If you understand the basics of track and balance and the a few truths about the RADs (like it will lie to you, which is where understanding M/R track and balance comes in) then its actually easy.
Track first, always. Ground track & balance the best possible before flying. Never ever do what Bell tells you and zero everything out. If your vibration is a vertical then its a blade, a lateral is hub weights.
Tell the pilot to NOT hold the aircraft dead steady in a hover when tracking, let it drift a little. Every control input messes with the readings. Just dont crash
If everything is sweet all the way to 130KTS, and 130 and let down is a bit high, live with it. You can not expect new performance from older elastomerics. Get the best most acceptable ride where the aircraft will be flying the most. I seen hover, climbout, cruise be all below .2 and mostly .1 or less and letdown be a .4. to get the .4 in let down lowered screws up everything else. Gotta live with it.
Learn to use "view perdictables" and write down the current IPS and clock angle. Dont know how often people went right through the clock and then complained "it got worse". Also if its a vertical, turn off the balance section and recompute the best possible solution. It will surprise you.
Make an old track and balance chart and plot your moves so you know whats going on. This works for ALL tracking or balancing with the RADs. Especially with the fanshaft on the 407.