Feeding mag ox plus balancer?

[Poingsettia]

I have two fat ponies, both on dirt paddock and small track, no grazing just weighed hay. In the evening they get Top Spec chop zero, and Top Spec lite balancer.
One did have a bout of laminitis and has a crest, which is softening thankfully. I’ve been feeding 10g magnesium oxide, but am I feeding the correct amount to benefit?

Website suggests 0.6% magnesium in the balancer.

 

[fidleyspromise]

That's the amount I feed my cresty new forest pony. (She 450kg).