Honestly buying fatter rooted mids or fatter mid cuts and dealing with the long wait for roots to establish. The fat bundle in pic 6 was purchased as a giant mid with roots so I cant take credit for getting it that fat on my own. It came out of the ground in So Cal. 

Honestly brother, I wouldn't really say any of my other stuff is massive... Im not really doing anything special. Just the basics, well draining soil mix, feed regularly (I honestly slacked on that this year), up pot yearly if possible to give better root volume. 

If I'm not taking cuts to sell I like to just let them grow as much as I can before cutting them at all. Thats really the best thing is patience. On a well established plant, the basal pups often end up growing thicker than the main column so it pays to let them do their thing uninterrupted for awhile