I haven't been dipping for a while - still trying to get my shoulders completely rehabbed. Dipping seems to aggravate it a bit. Oh, and my homemade dip station is all screwed up.
Last time I was doing them, I was only doing about 50 lbs plus BW for my 5 RM. I don't remember my weight then, around 200 I think. I'm going to try to get back into dips as soon as I fix up something to dip from though, for now I'm sticking to close-grip bench press for my tris. I might do tricep extensions on my off days for some metabolic work as well, I don't know yet though.
I was thinking about my arm imbalance, and I think it may have to do with the fact that I do a lot more pulling than pushing type exercises. I do on average only 2 pushing lifts, usually ending up only about 3 sets, whereas I do about 6 - 8 sets of pulling movements. I don't know for sure though. Maybe some of you guys with big tri's do a lot of pushing exercises?
Anyway, at the very least, maybe I can get two chairs to do dips during my negatives. I think that suggestion would definitely work...