Everything I read said roots grow in the dark period not so much the growth... or "Stretching for the light" as you put it luda. If you have some good references for that info id love to read it.

Also ive seen and had buds that grow like that. Actually found out the tops get like that most often than not from it being too hot. Were those leaves in that pic heat damaged?

Anyways... The dark and ice water definitely work. When you decide to harvest take a nug or two, then put the plant in the dark for 2-3 days with ice water then compare the two buds. You will notice a difference and will know for yourself if it works.