I think your 1916's with 100 grain heads seem about right. You might want to try 125 grain heads and see if you can tell any difference. What you want to look for is any wobbling of the arrows in flight. If you're just learning to shoot, some of your arrows are going to wobble anyway, so you're really making comparisons over a number of shots, to see if there is any less wobble one way or another.
Eventually, when you have your form down, I recommend shooting bare shafts because then you can answer your own questions about this.