RE: Ways to add weight at the business end....
You can get brass or stainless steel inserts. Gold Tip has a weighting system that screws into the back side of the insert. Heavier heads, of course.
And you can take weight off the back end by going to lighter vanes or, better, feathers. Taking 30 grains off the tail end has the same effect as adding 30 grains to the nose.