have got 2 xxx aks on the go which i flowered at 10". they do not seem to have stretched much as they have grown out as much as up
they are just starting to bud up nice.
i topped one of them and it has loads of good sized bud sites. looking at her, i would say its deffo worthwhile topping this strain. it has not kept the hight down however, the topped plant is as big as the untopped ak and untopped b/gum i have. i did have a fungus gnat prob in the untopped ak so that may explain why. is b/gum usually smaller then ak?
have a go at topping a few of your ak's, if they turn out anything like mine has done you will thank me

i have a good 2 square foot of bud sites from that one plant.
hope you have a good filter, the ak's stink to high heaven. totally drowns the sweet b/gum aroma.
goodluck