A heavier broadhead will change the dynamic spine of the arrow, and you will have to either shorten the arrow or replace the arrow with one with a stiffer spine.
It's hard to tune the arrow with a broadhead attached, so you will probably want to find field points that are the same weight as the broadhead you want to use.
Say you want to use 150 grain broadheads. You can test with 145 grain field points (I don't know why they don't make 150 grain points, but hopefully the extra 5 grains won't make much difference). You will find that the bare shaft tests weak with the 145 grain points, if it was perfect with 100 grain points. You can try cutting down your shafts to 29" if that wouldn't be too short for you, and see how that tests. Or you can use a stiffer shaft, such as a 2018 or a 2117.