Howdy Casey,
"It has dried all summer..." Has it been drying indoors? Or, has it been sitting outside by the wood pile? ==>(Not good.) And, did you seal the ends? (Covered the ends with glue or paint or somethin' to prevent end cracks?)
What is your draw length? This will determine the approximate length for the bow.
With a heat gun, I've seen where some folks have done some amazing bending (or unbending, or untwisting). But, if there are knots or an abrupt twist, then you might have a real problem. So, let's see the pic.s.
In a recent post, TRONMAN said, "I made a flat bow out of maple board from Home Depot. I backed with linen and is 66 inches long. It has a 4.5 inch handle with 1-3/4 inch long fades. The bow is 2 inches wide at the fades and it remains 2 inches wide until the last 11 inches where it taper to 3/8 of an inch at the tips."
I think these are pretty good dimensions for your bow as well. (For a 28" draw length.) And, I think, your target draw weight should be about 40 to 45 pounds for turkey huntin'.
Best of Luck,
Canoe