wow man im surprised you didnt go into precipitated withdrawls taking the subs on that high a dose of
methadone. you usually have to go down to <30mg to change to subs.
if the subs are still in your system they will block the methadone, as they bond better to the mu receptors than meth.
so you took 16mg of sub, after how many days off the meth.?
subs have a half life of 36-72 hours, so if you do take your meth you may not feel it. not 100% sure though i have never tried it. (taking meth on my sub that is)
anyway thats what i heard, if you take anything on sub, it wont work unless you have heeeeeaaaaaaps.
good luck. and i hope someone comes along who knows more than that for you.