As far as heat treating... Some heat it to a nice chocolate brown color, others to varying degrees less than that. Even color change is what you're looking for, to show you the wood has been altered. Make sure you let it re-hydrate before bending.
My method thus far is best described as "Steady the bow 8" above low gas flame on stove, and see how long before you turn your hard work to charcoal." Honestly though, I'm getting better every time (paying more attention) and after igniting a boo slat on my last attempt, I got a real nice even temper on my maple recurve today.
My first completed bow was an un-tempered 1x2 red oak, and it took 2" of just-unstrung set on the top limb, and 1.75" on the bottom. With yours a full 1/2" wider than mine and heat tempering, 1" or less set is entirely do-able. Don't let it hinge, and don't pull past your target draw weight or length.