I put Sims string leeches on my string only. I
don't put them on until right before bow season
and only after my bow is already tuned. I then
take them off as soon as my tag is filled. They
really do a good job of silencing string noise
and I've got 2 years out of 2 leeches. With the
leeches on my arrow speed loss is only 1-2 FPS.
I tried it with four, attached to my cable also,
and did not notice a difference from just using
the two.