Go to bowmaker.net and read the tuning information.For a broadhead to fly well and impact in the same place as your practice arrows,the setup has to be tuned.Changing point weight,changes the dynamic spine of your arrow,ie. makes the spine act weaker (more head weight) or act heavier 9less head weight).
A change of 25 grs head weight can equal 5-7 # of spine weight.Fletched,field point arrows can fly vey well when not really tuned but a bare shaft may act differently and a broadhead will even point out more discrepencies in the tune.When you find the right point weight for your setup,all 3 shoot impact together in the target.
The best way for me,is to have a big variety of field points and shhot both fletched and bare shafts together.When I think I am about there with the point weight,I then try the same weight broadhead.
My point is,if you haven't tuned the setup yet,don't settle on a point weight.Your setup will let you know what that should be.All the information you need will be at that link.Good luck.