From the last pic it does look like the top limb is stiffer...there is still the question of string alignment with the handle. Isn't it almost center-shot with the stiffer limb for the top?
Options:
...reverse limbs and tweak with heat to realign the string with the handle
...weaken the top limb through removing wood, will lose draw weight this way
...cut an inch or so off the bottom limb to stiffen it up some, may gain a pound or two of draw weight
...heat treat the bottom limb ONLY, to stiffen it up? potential slight draw weight increase...haven't ever tried it on only one limb, may not make enough difference to even it up
...if it shoots good, leave it alone and shoot it as is