Fred,

I have some Beman ICS 400 shafts up at the house. You are more than welcome to fletch a couple up to your usual specs to see how they fly out of your setup. They should be lighter than what you are currently shooting though I do not know if the spine is gonna work for your setup or not. Trial and error I suppose. You could also play with the point weight to some extent.

Thanks for the fibers. The yellow worked great.