Thanx for all the insights guys.
Toby -- Whenever I plateau (that often happens with my legs) I would break that plateau by usually doing static holds on the last rep of the last set, once a week only. After a week or so, I'd load again. On the upper body I'd just drop a few kgs for a few workouts, and them it would start incresing its load again. If tried that, and so far, none.
Serpent -- That's a nice idea. Originally my bp set is a 1x12 warm-up (with only 50% of the normal load) + 4x6 of the real thing. I don't know what my 1RM is right now, but I can check that tomorrow. How often should I do this new set? Once, twice a week?
fa_jing -- those were my thoughts exactly. I'm not very into isolation exercises, and the flys usually make my spine unconfortable (specially the reverse ones).
" I'd say I'm sorry to disappoint you, but I'm not. I excel at not giving a $hit. Experience has taught me that interest begets expectation, and expectation begets disappointment, so the key to avoiding disappointment is to avoid interest. A equals B equals C Equals A, or whatever. I also don't have a lot of interest in being a good person or a bad person. From what I can tell, either way, you're screwed. Bad people are punished by society's laws, and good people are punished by Murphy's Law. So you see my dilemma."
-- Georgia "George" Lass