Total arrow weight can be gained by adding weight to the front or to the whole arrow. You can add weight to the front end of the arrow by using a heavier insert or by using steel adapters for your woodsman, but by doing that you may need to go to a .400 if your given set up now is flying "true" for you. It really depends on how much weight you decide to add. Also, the heavier spined axis arrow will be about .9 gpi more giving you more total weight. If you want to add weight to the whole arrow, you can use weight tubes or use a different arrow as you suggested. Carbon express also make a heavier gpi arrow called the heritage.
What are you looking for in terms of total arrow weight? How does your arrows fly with the given length and the 150gr. tip?
Ryan