Yeah I think with training it’s also very individual like I’ve done rdl 320kg with absolutely zero hamstrings lol now I do just curl variations and they are growing no rdl
I don’t believe hamstring is more a load issue to many overload the hamstring and it’s all lower back and over rush the reps without proper contraction it’s exactly like the bicep less weight is needed imo more volume intensity
If you haven’t tried any the above give it a try mate I wouldn’t start going on any other medications as they can make you feel even worse hungover feeling the next day