spitz,

Sorry for not replying sooner. G2 covered most of it but to further help with your question I suggest checking out www.bowjackson.com . You can play with his various calculators which give you things like FOC, arrow weight, Kinetic Energy, etc....

As for not having the 125 grain point affect anything.....that all depends on the specifics. Putting a heavier point on any arrow affects the arrow's spine and FOC balance....especially the former if you are going to pump the draw weight up. Increasing draw weight and increasing point weight together can greatly weaken the arrow's spine thus decreasing accuracy and penetration.

Hope this helps.