I am convinced any auto can become so big by simply planting them direclty in a good soil mix and watering them correctly and not feeding them the first 6 weeks
Agreed 100%.
Its a shame for all the mold damage but you know every year is a different story outdoor. Maybe you can concentrate on autos for early harvests and less mold-prone sativas for late season / greenhouse?
Peppers look good also
Best of luck
=K