I was wondering if anyone knew how much a whisker biscuit slowed down arrow speed vs. a drop away style rest. It is such a great hunting rest but feel like I'm giving up too much! And while I'm on the subject, what about rubber tubing that fits on the peep sight. How much speed is lost vs. using something like the tru peep?

I shoot a 29" 70lb McPhearson Hornet with an IBO of 308. However I am only getting approximately 240 fps with a 390 gr. arrow. Does this seem a little slow or about right? Thanks.