well I am not len but here goes

reducing point weight.
cutting the arrow down.
more fletch on the back to create more drag.
proper spring tension on the rest.
fallaways need to start dropping at least 3 inches from when the arrow is released.
proper tiller adjustment.
make sure the cams are in time (2 cam).
make sure a single cam is not over rotated.
Nocking point is in the correct location.
arrow sets on the rest as close to the center line between the axles without sacraficing shelf clearance.
Zero fletch contact.

OK Len did I miss any thing?[8D]