i'm not sure timing is as critical as the dosage.
taper up and down with t3 for no more than 4 weeks (though some will argue that longer durations arent a risk)
25mcg - 50mcg - 75mcg- 50mcg - 25mcg
clen should be cycled 2 weeks on/2 weeks off.
i dont react to clen but most users like 100mcg-200mcg a day in divided doses.
try ventolin. awesome stuff thats very similiar to clen.