We have a chronic case with my fav. Mare and it's a learning curve for sure. When she had trims during a particularly 'sore' episode, I soaked her fronts in cold water for about 20 minutes before the farrier got there. We used those large black rubber feeder bowls at first, and now I have Davis soaking boots a size larger to allow for more cold water around her foot.
Remember, what's done is done, you can't change that but you are doing all you can now. I know how to manage my girl now for minimal soreness and she rides always in boots on the front w/12 mil pads in them. Just to say, chronic founder or laminitis cases can live pain free, happy lives w/proper care. We've been managing our girl for over 7 years.