ArcticBowMan

I'm trying to figure out the speed and energy that my bow is producing on bowjackson. I would rather toss an arrow through a chronograph, but don't have access to one. Here's my hold ups on figuring out speed.

1) SE/PDF Ratio (~0.5-2)

2) Bow Efficiency in % Is this the let off of the bow? It is rated at 70% let off, but meets the 65% let off requirement for P&Y. What number do I use there?

3) Virtual Mass (grains) Is this arrow weight? It asks for that already, so I figure it must mean something else.

Here's my full set up.

Mathews Q2XL set at 65 pounds with 29" draw length. SL2 cam with 70% let off.
string silencers, loop and peep sight all weighing roughly 15 grains.
Beman ICS 340, 29" with 125 grain tips, total weight of 452.8-454 grains

Thanks in advance