Hello everyone, thanks for your replies.
Shovel, I've used bamboo now
Built2spill, I've started pinching the bottoms a bit I tried to pinch and bend the top of the main stem, so the colas from the bottom would grow upwards, but the main pinched stem basically just decided to repair itself, straighten itself out and grow upwards again.
Morel, I have low stress trained one, with a near horizontal grow for the main stem. It looks like it's working well.