I've found the First Set Last with it's higher reps (or shortly the BBB) has been good for hitting the hypertrophy side of it, with the 5/3/1 sets being good for the strength side. Hardly chasing a J-Lo booty, but even as a bloke after having a flat arse for 40 years, the wife admiring it now there is some curve doesn't hurt the ego.hip thrusts aren't a traditional isolation and technically it isnlt as it crosses the hip and knee joints but it trains 1 muscle only - the glutes...so it stands to reason that if you're doing a hip thrust then you're wanting to train the glutes so if you're not actually feeling it in the glutes then why are you doing it?
instead of thinking of a specific number of reps for isolation exercises i think its better to think of for as many reps as i can feel the muscle working whether it be 3, 8 or 15...then you use a wt that lets you reach the specific reps you're after to match your goal
i did try hip thrusts for max effort type of stuff (5 rep max beating each week) but i stopped once i wasn't feeling it in my glutes enough which was 130kg-ish