I got 77g in 76 days from one plant. I'd hardly say that is tiny.
out of 3 cycles of 2x DD autos and one lot of 5x DD autos:
biggest was around 4.5-5ft tall from 8l pot in coco - perlite (20%), 20-4 light cycle, lucas formula feeds.... 108g dry... No LST, topping, supercropping or any of that, just let them do their thing. this one was beyond purple, pure black when dry and potent as fuck after a slow dry and few weeks cure tasted like fruity aniseed with a hint of petrol (in a good way)
Had a runt that stayed green and never went purple, this was the smallest out of all (55-65cm but bushy) tasted mega fruity though and lovely and smooth, best tasting of the lot and not at the cost of too much potency) 49g dry
bottom line, i agree... after 4 cycles, none of them are what i would consider tiny by any means... Even the green runts are worth it.
Anyone going the coco route, "less is more" is very true at the start, even with lucas i suggest reduced feed to just over 400ppm after 3rd node, they can take 700-1000ppm in flower (depending on conditions) but dont push it... They get N hungry later on, not worth going just bloom in the final weeks IMO as they yellow out too fast, recommend at least half strength part A throughout final weeks alongside normal amount part B, this kept them looking healthy and packed more weight than previous grows. Some epsom salts will take care of any mag deficiency you may encounter during mid grow.
Another point i must add... out of well over 100 sweet seeds beans, 100% have germinated. Can't be bad eh.