Forageplus - I use the performance balancer which is I think the most expensive but my horse looks and feels dramatically better on it. I'm coming around to the thinking that if the balancer really balances the forage, all the rest of the feed I put in can be cheap and easy... with Kwikbeet, salt, magox and pretty much an egg cup serving of linseed it certainly is that.
At the very least i'd have your forage analysed and take it from there and then have a bespoke 'balancer' and a feed plan best suited to your horse and their needs.
Forage Plus although expensive initially can provide you with this service. I have found this site to be invaluable especially with a barefooter and IR/EMS.