I'm no Sacalait Master, by any measure, but me personally, if I were using braid I'd go with the lightest I could get ahold of. 10 lb. if I'm shooting at the heavy cover, but general Sacalait fishin', if "they" make a 6 lb. braid, I'd go that route. I have a Penn Squall spinning rod with a Penn Battle 5 on it, with a 300 yd. spool of 20 lb. Power Pro. I thought I did good with a 7 lb. Mangrove Snapper, then thought I did good with a 20 lb. Blackfin Tuna...oh no...while it took me about 45 minutes, I landed a 50 lb. Yellowfin Tuna with that 20 lb. braid and Battle 5...in extreme open water, but I did it.
Braid isn't quite the same as mono or fluoro. Braid is serious bid'niss. Even frayed, braid can hold up well. The mono's are extremely compromised with the smallest nick's or fray's.
Just my $0.02