I am guessing that shorter bungies and many more of them would work better than those long fingers..  I have 2 drum type commercial pluckers.. they run at about 250 rpm..  and the plucker with more densly spaced fingers works much better and smoother..  the sides of the fingers do not even touch the chicken.. the tips of the fingers do the work.. so the more tips, the better..  I can pluck a chicken in 20 seconds, easily..
you hold the bird so that the fingers are pulling from the tail toward the head..
and that guy who said to have the top of the wheel spinning toward the operator must have liked to wear feathers..
I can show you how to build a drum type plucker if you are interested..  let me know..
I am just about finished building a whizbag type (modified) plucker.. No welding involved and my feather plate is within 1/32 " of true round..
but that is another subject..
......jiminwisc.......