With a bow that gains 3 pounds per inch at full draw that one pound increase is simply drawing the bow an extra third of an inch...I like the image a friend who is a bowyer puts forth when he says "your draw length is whatever feels comfortable to you AT THE TIME"...I once chronographed a bow with the same arrow in the morning and again in the afternoon...in the morning my three shots gave identical velocities of 185 fps...in the afternoon my three shots gave identical velocities of 180 fps...that particular bow, a 1960 Kodiak, increases/decreases by 2 pounds per inch and I doubt that I was drawing it more than a half inch less for the second series...so let's speculate that a pound of draw weight might be worth as much, or as little, as 5 fps...more likely is that I was getting more of a dynamic release effect, pulling through the shot better, in the morning and, more of a static release in the afternoon...my advice to people lately is this...spend the time you would thinking, and asking, about equipment differences on thinking and studying about solid repeatable form and you will be far better off...and by the same token spend the money you would buying equipment on coaching...and of course recognize that I do not take my own advice since I have already spent an average person's lifetime of equipment expenditure this year...that being said I spend an awful lot of time working on repeatable form
DDave