3/4" ain't no set to worry about in a bow that heavy, that short.
If you heat treat it, as short as it is, you're gonna gain a lot of weight, and who knows what's next? Then you have to re-tiller and kill it? Or, at 77 lbs now, the back finds a pin or a swirl and lifts a sliver at the corner?
Keep it. It want's to be a bow.