Jason....there is always exceptions to the rule. Your long draw probably didn't help any I would surmise.
Actually, I shot a 35 pound target bow from around March through August...when the State Shoot was held. Then I would go to my hunting bow. I was hunting with a 49 pound bow at the time, and it wasn't a big deal; however, as you go higher in weight, the difference would be greater. The form should still be there though and it should only need tweaked with practice.
I like to experience all bows...target, longbows, hybrids, recurves, light to heavy (my heavy). And, as I said, I hunted groundhogs in the summer, so my layoff time wouldn't be as significant as someone who didn't touch their hunting bow at all for several months.
A lighter bow is great for redescovering form that has went haywire, or simply experiencing another aspect of the sport. There's nothing that says you can't shoot them all at least a few times each week or month. Common sense helps here.