Question for the Musky guys

I catch between 10 and 12 Musky per year(Susky river). I even caught 5 in one afternoon 3 years ago. Sounds good BUT they are all between 27 and 31 inches, everyone. The biggest one I ever landed was 37 inches(small I know). My question is why can I not ever hook into a good one(45 and up)? There has to be a couple around. Do smaller Muskys school together? I have tried larger baits(HJ14s),bucktails but I usually catch the same size fish or none at all. Any ideas what I am doing wrong?    In my opinion Steelhead caught on spoons(using light line) in the lake are the best fighting freshwater fish there is.    Thanks.

ShutUpNfish makes some good points.  There are few really big ones out there, at least in our area.  It can take quite awhile to get into a really big fish.  I have fished for muskies in several areas where there quite a few and only put a couple into the canoe that were over 40.
 
I have heard that in the more northern lakes in Canada and the mid-west you can find some monsters that can go into the 60 inch range, but even there you have to work to find them.  Of course, there is a bit of luck involved as well.
 
I did read an article awhile back about a guy who was fishing with believe it or not dead squirrels.  He would rig them up and cast them out and within a short period of time had monster muskies attacking them.  I have not tried squirrels for bait, but maybe it is worth a try.  The trick is finding them dead in the summer time.  You can spend quite a bit of time looking for good road kill...