too low ph, for soil ur gonna want just 6.5, not 5.7, keep it at 6.5 and see if they get any better
5.7 in soil means it wont uptake NPK correctly, thus explainjng the red stems and yellowing at the bottom
Also the droopy leaves might be a sign of overwatering, if ur plant doesnt tend to point the leaves upwards consider the overwatering too.