Easing off the right limb will also take some load off the left and make it look less over stressed.
DO IT SLOW !
Little at a time, plenty of pics and thinking.
Bit like the old joke... Tourist asks Irish guy "how do I get to Balleybofey" and he replies...
" Sure if I were were you I wouldn't start from here"
The art of tillering is preventing it getting out of kilter rather than fixing it, so ideally you shouldn't be starting from here!
Hope fully it will even up fine if you take it carefully... nothing much will seem toi happen at first, but don't be tempted to take too much off. Very small changes and it will slowly shift the ballance between the limbs.
Del
(Sorry if this sounds preachy
... I just don't want to see a good bow spoiled)