When people say a bow is more efficient with the limbs maxed they are talking about the bow being a little faster, pound for pound. It isn't much though with modern bows. For instance, take a 60# bow with an efficiency of 80%. This means that the bow uses about 80% of its stored energy to propel a given arrow. Now if you were to take a 70# bow and back the limbs down to 60# the efficiency would drop a couple percentage points and thus that bow would shoot the same arrow a few feet per second slower, but again, it is only a few fps. Not so much to be concerned about.
Brought up by Roger is that you can order any Martin bow with 55# limbs if you so desire. The bow would still peak at probably about 57#. It just depends on how much the cables are wrapped up. You can alway play around with adding or subtracting a few twists on the cables to alter the draw weight a few pounds and/or change the way the cams feel as they roll over.
What it boils down to is nitpicking to some degree. Something else to consider is that with today's higher energy cams you'll end up with a faster bow anyway, even at a lower draw weight. I'd think about it and just make things easier on yourself.
I know as I get older the need for speed and energy is leaving my pea brain and I think more in terms of being able to draw the bow more easily and not have sore back and shoulder muscles the day after I have a long practice session. It's more enjoyable being able to draw and shoot that first arrow with confidence. To that end I noramlly shoot around 45# these days, working my way back toward 50#, and I wouldn't hesitate to hunt any deer sized game with complete confidence, and confidence in your equipment and your ability with it is always a major consideration.
Now I guess you're just as confused as ever.
If You're Not Living on the Edge You're Taking Up Too Much Space
Martin/Rytera Staff Shooter
PSAA Life member, UBP Life member
PADI AOW Diver