T3 vs T4 or can one use both?

[lex-ttp]

I used to use T3 for years on and off and my first couple 6-8 week cycles (w/test of course) was amazing at getting my internal thyroid glands to burn fat w/in a week or 2. Over time however, I found that it was not having the same effect and less and less over the years whenever I'd try it again. I always would go off cycle for as long as or longer than on when used. Can anyone tell me how T4 has worked in comparison or even combined? I would love to try again but do so the most effective way (either T4 instead of or combined with T3) . . .Please advise and thanks, Lex