Don't worry girls/guys - if they are stamping and look a bit uncomfortable (well they are...) the lime dries out any wet between the cleats and 'disinfects' at the same time. The discomfort will only last a day or so until the hooves harden up. With all this wet weather their feet are getting soft so infections can get in, by getting them to walk through the lime (mine do it to get to their lick) they get a coating of the lime. It's also good if you can put it somewhere dry as the rain/wet will wash it away in time.
Since I've been putting lime down I've rarely had a sheep with scald and I don't have to trim so often either.
Blackbird - not sure your bark chipping with last long, they seem to go to mush and disappear into the mud. Even the chicken pens which had a 8" layer in the summer have gone the colour of mud...
It's best to try to get somesort of stone down in the summer when it's dry as it has time to settle and go hard. Putting it down in winter it also has a habit of disappearing into the mud....
Sorry don't want to sound

but just wanted you to be aware of what might happen.
Sorry moprabbit only just read your post further down - been under the weather

for a few days so not been on TAS (thats how uughh I felt didn't even turn the computer on) you should only need one bag be careful spreading it - I use a childs sand spade and keeping it level shake it gently so only a fine layer is spread, do be careful as it is potentially hazardous. You should wear gloves and goggles (not that I do as they steam up and I can't see....!!) but I make sure there is NO wind. As said above it will wash away if TOOoooo much rain so best if you can do it on a dry/windless day - if only