Barometric,
You might want to rethink things -- or at least how you want to use the reel. Bottomfishing and trolling are two completely different things. It really requires a reel to be set up differently.
Bottomfishing with braid is okay; especially if the water is deep and/or there is a current. The thinner diameter of braid will help get your bait down and minimize the stretch factor in deep water that you'd get with mono. In that case, fill the reel 1/2 way with 30lb mono and top it off with 80lbs, no more than 100lbs braid.
Why the lighter braid? Because 80lb braid has the equivalent diameter of 20lb mono, 200lbs braid has the equivalent of about 50lb, which mitigates the braid's advantage to deal with the depth/current problem.
For trolling, braid's advantage comes from increased line capacity for a given reel and line test. The "downside" is braid's lack of stretch -- braid just doesn't have enough. When you're trolling at 7-10 knots and a fish hits your bait/lure at 10-20knots, WHAAAM, the lack of stretch is going to result in a lot of pulled hooks.

In this situation, fill the reel with 80lbs braid 1/2 way and then use 30lbs mono the remainder. That mono is between the reel and the lure and provides the "give". Just make sure to initially wrap 30-50yds of mono around the spool's shaft to keep the braid from slipping.
I wouldn't use PP for this. PP has a coating that comes off rather quickly and gets inside a reel's inner working and can gum it up (especially on conventional reels). The best braid I've found for reel backing is Jerry Brown's Line One Spectra. It's not coated.
Tightlines,
PB