Everyone IS different.I think Eugene is right.You just don't have enough shaft length to cut to make that much more point weight work.You could cut some shaft length to get in proper tune.I decided some time ago,when I really wanted something different,I would just put the arrows in the classifieds,lose a few bucks but get what I really needed.
I will tell you that when I jump to the next higher spine group,keeping exactly the same length arrow,I end up with an arrow that weighs app. 120 grs more.That is maybe 90 or so grs extra point weight plus heavier shaft.I like heavy arrows so that is fine but if you don't want to increase weight that much,don't be too quick to cut the heavier spined shafts till you see what is what.
225 grs won't give you enough FOC to make a tremendous difference and since you are talking about using the same head,maybe what you have is fine-unless you are shooting for more overall arrow weight.A stiffer shaft would get you that.