This post is kind a a multipart question, looking to tap some of you bow wizards for information, since I'm really no kind of a bow technician. I hope some of you will stick with this long post and help me out. Thanks in advance.

Since I began bowhunting four years ago, I have had a problem with broadhead flight. For the whole four years, I have shot ICS Beman Hunters topped with 100 grain broadheads, on a Matthews MQ-32 bow at 55 pound draw weight with 30 inch draw length. I have switched broadheads nearly every season, first I shot NAP T-heads, then Muzzy 3-blades, and last year the G5 B-52 (two-blade cut-on-contact).

Now, I lean heavily on my local bowshop, and have worked with two different shops to help me through the tuning process. We all agree that I am tuned and shooting bullet holes on paper.

The problem is that when I shoot my broadheads for groups, each broadhead/arrow combo tends to fly to its own unique spot. I shoot 15 or 21-shot groups with each arrow, taking several weeks in the process, and recording each hit on graph paper. I'll have 6 different arrows set up with broadheads, and if I'm lucky 3 of the 6 arrows will group together, then the other 3 arrows tend to fly to their own unique spots 1-4" off mark. Mind you, most individual arrows group well with themselves, giving me 3-5" groups at 20 yards in the 15 or 21 shot groups. I'd get those same sized groups with field points. (I'm a competent, but not astonishing, bow shot.)

Obviously, I would rather have all my arrows striking the same point. As it is, I go into a bow season with my 3 arrows that hit right on. Then, if I ever get into a case where I'm launching, say, the fourth arrow in line, I have to adjust my sights ever so slightly to compensate for the different center strike on that arrow, and so on.

I'd like to change this case, and here's my theory. I think that maybe the problem is ICS Beman shafts and their spine tolerance. If a set of arrows has inconsistent spines, would that account for my problem?

My proposed solution is to go to a heavier arrow. I know that traditional bowmen typically have no heartaches with arrow/broadhead tuning, right? They typically are shooting heavy, slow arrows, and we modern hotrods are shooting light, fast arrows. Shouldn't switching to a heavier arrow help to alleviate my problem? I'm thinking of going to about a 500 grain setup, from my current setup of 440 grains. I'm now getting 238 fps at 440 grains, so I should get about 225 fps by bumping up my arrow weight 60 grains. Also, I'm going to switch shafts, to either a Carbon Tech or an Easton that are a bit heavier than the Bemans. I have seen an article fairly recently on the importance of spine consistency and it listed the Carbon Techs as rating very well. Interestingly, although they listed spine tests for several popular shafts, they were silent on ICS Bemans.

To reiterate, my main questions are:

1) Could inconsistent spines cause the problem I've outlined?
2) Wouldn't heavier arrows tend to smooth out this problem?
3) What are the ramifications of shooting heavy arrows? I'm looking at 500+ grains on a
55 pound draw.
4) Could it be that the situation I've described is more common than most people know?
How many people go to the lengths I've described to be sure they don't have this
problem? My first year at bowhunting, I didn't do this, and just rationalized the fact that
my broadhead groups tended to be about 1 1/2 to 2 times my fieldpoint groups.

Again, thanks for bearing with me, and I'll check in tomorrow or the next day to see what you all have to say.