1. I just start 10 pounds heavier than my 5rm and increase the weight every workout until I max out.
2. I think you find your new RM's the week after you finish the neg's.
It's probably pitcher's elbow, I developed it after doing heavy power cleans in my garage. Not being able to drop the BB on a platform was way too hard on my elbow.
It takes weeks-months to heal. I had to do pull-ups this cycle. Try doing pull-ups, that may help.
i agree, stick with the presses. When you hit your 5RM keep adding weight and do push presses. When you max those, then do push or power presses to do neg's.
The principal is to do as many sets that will still allow you to train the muscle at least 3x a week without a loss of strength. I have done single sets when doing 2x a day MWF and gained 5-7 pounds. I've also done multiple sets when 1x a day MWF and gained.
I've done the following for a year now MWF:
A: squats, bench, bent rows, standing press, shrugs
B: deadlifts, weighted dips, weighted chins, standing press, shrugs
I may do 1-2 sets for bi's and tri's, though for this cycle I haven't.