If you wanna run T3 at no more than 25mcg to boost protein synthesis and give your metabolism a kick, go for it, but I don't know if JW would be enough to counter catabolism from higher doses. Try fish oil at the exact dosage of 900mg EPA & 600mg DHA and green tea extract (cheap caps at Nutraplanet). According to a couple studies, that should buy you an extra 400-500 cals a day.
If you want to go the thyroid route, you could consider 7-oxo-dhea transdermals like 7-Cort, or ashwagandha at 2-3g/day, 5% extract, or eqiuvalent with a different extract. I always preferred going the route of boosting endogenous production rather than replacing it with exogenous hormones. Good luck.