RE: Supersetting or going heavy
Sounds like you mean compound sets.
Compound sets are sets multiple exercises undertaken on the same bodypart as one set i.e. tricep extension and tricep pushdown
super-sets are exercises carried out on opposing muscle groups - say tricep press and bicep curl.
sounds to me like your thinking of doing compund sets and hitting that body part from a different angle in the same session?
your answer: if it is working - keep at it. howver you might want to do the odd light week, going heavy all the time really wears you down.
Pain is just weakness leaving the body..