I and several others using my loaner rigs have caught Yellow Fin Tuna in excess of 100# on Power Pro 65# Braid. Never had a line failure with Power Pro. BJ One and the OTI PE Braid sold here is very good line also.
I think tying proper knots for joining the leaders are the keys to any braid working.
power pro in the heavier poundage should be alright. ive never had an issue with the 80 lb-150 lb power pro. the 80 lb braid is smooth enough i think. i personally use izor and varivas. i have spools of 80 power pro and 80lb jerry brown solid and there is no difference in smoothness or thickness. they seem identical to me. however ive had an embarrassing amount of failures with power pro in the 30-65 lb rating. most braided lines in the 80 lb class is pretty good. its all about confidence.
i have been doing my own personal studies on wax coated lines vs. non coated lines(with 65 lb braided line, which i think is the optimal line for tuna casting). if you use wax coated lines you should saturate the line on the spool with water so its not so sticky. after that the line comes off reel nice. i actually get less wind knots from wax coated lines than non coated lines. i do ALOT of field casting and so far this is my conclusion.
I don't like the gummy substance on PPro (PPro used to advertise it as giving their line "enhanced body"; maybe they were talking to guys who used PP's sub-60# line). I switched to JB years ago and have seen no reason to go back. Some no-name lines may be poorly made (lots of slubs; uneven strength, diameter). I doubt JB would tolerate that.
When I talked to guys I fished Big E with they said they would use nothing else and it's the best. They stood strongly by it. I have never used it but for chance at big fish I use more reviewed and proven lines.