AsNoriuanswered grow question 2 years ago i would say all good !
for future, pollination, temp or humidity high swings, wind damage or ph issue could lead to early going brown
for me personally 1.3 ml ph up was very interesting ...
They had BigBloom and GrowBig in trio, you should use all 3 till week 5 of flower, later drop GrowBig, think that was the way, you could underfeed them.
i was using fox farm for some time, had good results, but dropped the line.
happy growing !!!