Thats very good for great improvement in vibration, as I understand that you have used two thinks to solve vibration problem, one is fit FC below carbon fiber rod which creat pressure on FC . Second is you have added lead weight on FC may be to reduce damping effect of vibration etc.
Sir, if you have possible than can you please take a flight test with following conditions.
1) Apply foam pad at four corner as suggested by Mr. Tridge sir.
2) Fit FC below carbon fiber rod same as you have fitted.
3) Dont use lead.
We would like to see the results without lead weight. So we can understand propor concept of lead weight with FC.