I've never had problems with PP super slick 8... I use the SDJ and palomar, I use it everywhere from 10lb to 50lb test and I use it for almost everything....

I've seen several videos on how bad the abrasion resistance of power pro is compared to other braids and it's bad. I haven't experienced this myself though.

not a single issue with it for the past few years I've been using it...love it actually.

I also use the bobber stop above and below my weight so it doesnt touch my snell when flipping and leaving a bit of space really seems to help, as the bead never helped me out on heavy line, although I use it with lighter applications for mainly sound.

 

When I go heavy braid in heavy cover, I just figure braid is going to break a few times when setting the hook no matter what brand, and I never have it break at the knot, it is usually from a weak spot that develops from all the casting and repetition. I am starting to believe that I get bit more with mono or fluoro in 20lb testscompared to braid in the 40-65lb range and I truly think it is because braid makes noise when pitching and casting, rubbing against cover or weeds, and is opaque, although at times it is necessary since 20lb test is just is not strong enough for the heaviest stuff. I always buy Suffix 832, Power Pro 8, and Daiwa Samurai, and I have also had bad batches of every line I have mentioned where it would just break at strange times for no apparent reason and I have met others who have had the same problem....I check dates on packages even though braid is supposed to last forever, I don't like buying any line that has been sitting for more than a year.

If the line is breaking, something other than the line itself may be the issue.  I've been using 10# SS, one of my ponds has been fairly hot (hope I didn't give myself a jinx), every day I've been catch quite a few bass from 20-24".  Fishing with a light power rod, size 25 supreme, leader tied with an alberto to a lure with an ordinary clinch, haven't retied in a week, doesn't mean I haven't checked the line or knot.  Have I been lucky?  Absolutely not, the chain is perfect for 5-6# fish, not a darn thing wrong with the line.

The only times I've had this issue is when I'm fishing in really rocky areas (not an issue for you as you've stated), or if I've got something fraying the line (guide, weight...even one time the line guide on the reel).

 

I'd start by stuffing part of a cotton ball  (or a small piece from a pair of your wife's nylons) through the guides on the rod.  It doesn't take much to put a tiny nick in braid, and once it's nicked...it's toast.  If you get nothing there, try the line guide on the reel.

 

If it's not that, it's either your weights...or your knot.   Not much else left.