RE: will 100 grain broadhead work
I've hunted deer with two Parkers (as well as 3 Excals), 150 Terminator and Cyclone. Let me assure you that, if the 100gr head meets minimum weight requirements for your bow, it's more than enough for deer. My personal favorite is the Slick Trick. It's a 4 bladed terror that flies to the same point of aim as my field tips of the same weight.
PS The Cyclone requires a 125 gr head to meet min wt requirements.