would this work for building bigger crystals; start your extraction, do your wash and slow evap until you see crystals starting to grow as normal. my question is, could you add pulls to the original pull, that has crystals growing, to theoretically keep adding dmt saturated solution to the currently growing crystals to keep it growing?

I guess... but the solution would have to be well saturated to stop the formed crystals desolving back in.

thats kind of what i have just been finding out. i have a second pull jar that i am evaporating down, hoping to grow crystals in along side of my first. i dropped a seed crystal in there to get it going and over the course of the evening, its slowly desolving that crystal. however that jar had 100ml of naptha in it, so i don't know what i was thinking.

when adding more dmt saturated naphtha..make sure that its verY saturated..like when you blow on it..it clouds

This is called seeding.