hey man we all started somewhere. Welcome to the fun. Grats on the bow not breaking, which can be a feat in itself for a newcomer.
Couple thought: it's very late in the process to be heat treating now. I typically do that rather early after the limbs just start bending a few inches. Unless you have a crazy oberabundance of sinew (feel free to send excess to me
) I'd save the sinew for a future bow.
Clearly one limb im bending way more than the other. You shoudl defintely check the widths and thickness form side to side as a guideline. But a guideline is all they are. if a limb requires to be thinner to get the correct tiller then make it thinner. usually they come out pretty even bar any crazy knots and things. Now you need to start check the distance from the stirng to the limbs. At brace height you should find that the upper limb has a gap to the bow belly that is around 3/16 of an inch greater, so it's bending slightly more. Your one limb is way over that. As soon as you saw that you should have taken it out of brace and fixed the problem before bending it any more. keep tabs on those distances every inch of draw and never rush past a problem. You could mark a spot 1/2 way down then limb and use that as a reference or just run the tape measure across the limb and find hte biggest gap (string to bow belly).
Also when you do draw and take a pic, it helps to hold something straight up the to bow tips in the pic and do the same visual comparison. Ask if your limb bend looks evenish from limb to limb. if nto correct it. rinse and repeat.
Hope that helps!