No mate I start all 4 cobs from the beginning at about 36-40 inches above seedlings and leave them there usually. Don't move them at all, just let the plants grow up to whatever height they want. Maybe lower them a bit when the girls are in full on flower mode. This time I started lower and dimmed, can't say I'll bother again. Reckon thats where one or two of my small plants may have come from! My grape crinkle is a dwarf too mate!
I'm not a fan of small autos.
PS. MBAP twins been saved at the last minute! Been adopted