Grafted Aztekiums offset far more readily than plant on their own roots, as you can probably tell. Maybe try regrafting the plant onto a rootstock which causes the scion to grow closer to their natural form. Hylocereus is meant to be good for this. If that doesn't work, then you could graft onto a slower growing rootstock, such as Cereus jamacaru.
Not sure if either of those would help, but I hope it gives you some ideas.