Thanks for the good advice mate. The back is currently in some muscular spasm, but no serious issue. Ice, massage, fish oil, anti inflam, stretching, pain killers are all on the menu.
I've only got one workout left, and I'm chasing a PB best bench, and if the back is up to it, a PB deadlift as well, so I'll be doing everything I can to make sure I'm ready to go. SD really couldn't come at a better time though.
For next cycle, I'm going to start with 15's and cut back the 4 reps from 4 to 2 sessions per workout, using Max Stim techniques etc if required.
While the weight was heavy for me today, I think I lost concentration more than anything as the 1st 2 reps were perfect form, I just lost my way a little on the 3rd. Getting 4 reps at this weight should not have been a problem - sometimes the cards just don't fall your way I guess.