I stuck with my 5 rm on all exercises except dips and pull ups. For those, I added 5 lbs every other workout. What happened was that I could do 2 - 3 reps, then the rest negatives for a while, then one rep, four negatives. I never got to a point where I did all negatives. But like I said, I only added 5 lbs every other workout. All in all, it felt very good. Lots of DOMS afterward!!
To clarify... when I said I stuck to my 5 RM on all my other exercises, I found that I was able to increase my 5 RM on a few, due to increased strength. Not big gains. Just 5 or 10 pounds on a couple exercises, but I'll take it!
I also found that because of the strain of the heavy weights and negatives, I couldn't do decent bicep or tricep iso's anymore. I only did a set or two of each during the entire duration of weeks 7 and 8. Not a big deal to me, as my arms grew (proportionally) larger than any other body part.