Yes the 100 grain wasps you are using are just fine for elk. You should have no problem at all with penetration. Don't be surprised when you get a pass through (provided you don't hit the shoulder blade).

My set up is not too eifferent from yours. I am shooting CE cx 300's at 29 1/2 inches with 100 or 125 grain heads, depending on which head they will favor. I plan on trying out a few like the stingers, boss sst's, slick tricks, and razor caps (if they ever get to the shelves).