Are you saying your glue on points were 225 grains? Most Zwickey heads weigh from 125-135 grains, except for the 5/16 heads, which weigh 115 grains.
As lp said, you can use woody weights or go to a heavier glue on broadhead. Can also do an internal footing, i.e., drill a hole in the arrow shaft and fill it with brass rod. I believe 3R and others sell a jig for drilling the hole.
Could also melt some lead and pour it into the broadhead ferrule or sprinkle a little small size bird shot into it and tamp it down well. That will only add about 25-30 grains though if you still want to leave enough room for a fairly long point taper on your shaft.