Devon,
If the FRPV is sticking, or wore out rescaling the table isn't going to do you any good.
My Lb7 pump was a POS on my 2002 at just over 3 years old and 70K miles, it would barely hold 13K at WOT with a lift pump.
I tried a SD modded regulator and that brought the rail psi up to about 17K on the big tune at the time, less than a year later I swapped to a stock LBZ pump/regulator and held 22K after that.
My advice is to plan on either biting the bullet and be prepared to replace whatever is bad because I can't fix a failing hard part with tuning.
If you can't make/maintain good rail psi then you won't go fast at the track.
Your slip shows an 8.5 @ 79 mph is the 1/8th, that is 4-5 tenths slow and 5-6 mph off, so if you want a mid 12 sec pass you will need to trap at least an 7.9-8.1 at 85+ mph. That tells me that almost out of the gate your truck is losing rail psi or has a fuel delivery problem.
I know it sucks to spend more money, but the slip shows something is off and the way it is idling proves it.
