Said another way.... a 150 broadheadis no different than a 300 broadhead ( or field point).
It is the combination of the arrow spine, the arrow diameter, the degree of center shot, the length of your draw, the length of the arrow, the weight on the front of the arrow, the weight on the back of the arrow, your release and probably how you hold your tongue while thinking about it, that influences arrow flight.
You can tune an arrow a lot of different ways to use a lot of different point weights. and, you can often tune the bow to the arrow used as well.
Don't assume that you can drasticly change one of those above items and still get good flight without testing and tuning.
ChuckC