I'm not seeing that I said "letting it stand" - do you mean the part about letting it seal? The Vetericyn spray we were using sort of coagulates - like liquid bandage does - so we'd just hang on to her for a couple minutes after the soak/drying feet/applying medicine so that she could run around on the grass again (we free range in the afternoons).
But yes, I added more bedding in front of the roosts so that when she hopped down she had more shock absorption. She's a big girl, so I figured that might be contributing. But sounds like your girls have created their own problems in your raised beds!
About removing the plug, we did pull one of them out with tweezers (the more problematic one) after a good soak, and got some puss out. But I'd like to defer to some of the more knowledgeable folks about that because I've done it a total of one time. It does create an open wound, so you will want to wrap their feet up if you go that route.
But I'd say, if trying to get the plug out is not something you're comfortable with, try the epsom soaks every day for a week and see where you're at. If it looks like it's improving, I'd probably just keep at it, especially since your girls don't seem bothered by it. We noticed ours when she was already limping a little.
It took a couple months to go away completely on our hen (we were not super consistent, if I'm being honest).