Hey Growmie ...
Unfortunately, the low output at harvest is more than likely true to the plant having issues. But if you have space you don't have to kill it, let it grow and see what happens it may shock you. I tossed my very first grow due to overwatering and I wish I hadn't.
Hopefully, this was helpful and remember ..."Happy Growing" and "Free your mind one puff at a time".
Mr_Weeds_Autos.