I understand Magic Cushion is ground leather plus pine tar.
I’ve never used Keratex hoof hardener or Durasole but I understand these are the products that actually change the bonds of the hoof material. Both of them use a formalin/ formaldehyde ingredient that makes the hoof material resistant to rot and resistant to breaking off, so the hoof retains more sole. They are the only products that actually change the structure of the hoof. However I wouldn’t use it when there’s an active abscess as you want to encourage draining.
Multiple problems are annoying for sure. Soaking and poulticing are right for abscess but won’t help the thrush to keep the frog wet and soft.
There are a few traditional remedies for hooves, and the pine tar/ Venice turpentine family of ingredients are in many brands of hoof packing and topicals. I’ve liked to put Venice turpentine on freshly trimmed feet and it does seem to harden up the cut edges but I’m not sure how much effect it has. I think they have mild antifungal properties and with the right added ingredients might stay in the hoof at least over night.
I like spraying iodine nightly to dry feet up a little.
But if you have real thrush (as opposed to just soft funky frogs) you might need a stronger remedy.
Other common ingredients for thrush remedies are copper sulfate, things in the chlorine family, and topicals with antibiotic properties like that mix of Athletes Foot cream and Polysporin some people use.
Also check your trim and hoof balance. Contracted heels and contracted frogs encourage thrush.
And check your nutrition especially the copper, zinc, biotin and amino acids critical to hoof health.