Do not rush to get the bars and heels down. If the navicular bursa is inflammed be conservative. I would take a little every 2 weeks and see how he does. Talk to the farrier and see how deep he thinks the sole is and leave enough bar and heel for support. Unless you have boots, do not take it all at once. I would have him on full turnout.as far as triple crown senior, I don't think 2 pounds is the recommended amount. If you're just doing it for the supplements, give a handful and switch to a ration balancer. I would get him on some rocks/ pea gravel/ asphalt. He needs some harder surfaces. Get out on some trails!