The thing with shooting your bow regularly keep's your muscles warmed up and it's much easier to draw when they're warm,But when your hunting you don't draw and the weather take's it's toll on your muscle's.Sometime's when I'm in stand I'll go through a warm up by drawing at my shooting zone's to warm up a bit ,but after sitting awhile your muscle's will relax and this is likely why it feel's like the poundage has increased ,but that's not the case it's just your lack of drawing that make's it seem this way.

nubo