Hiya finn.

Mountain bro.
I've never experienced slower growth by folding it over,The top will grow just as fast..only in a lil different shape,Infact it will still encourage lower growth (even in flower),and also allow you to get more light to the mass of the plant's becouse you can lower the light).
If it was me? I would prolly super-crop it,Which mean's pinch it and fold the top over...But that's cause I've done it before and am not afraid.If it accidently kink's when you LST dont worry.

Dive:stoned: