An opinion please (about my farrier)?

okay my farrier came out on the fourth the monday of january. this has been the fourth or fifth time i used her and i have no complaints, until now. my horse has been barefoot for his whole life (5 years old) and he has pretty good feet. also on the sunday the 10th we went on the trail and there is a road and he was really tender on that. on the Tuesday the 12th i noticed maybe three times the whole hour i rode him he took an ouch step. then on wednesday he didn't want to move forwards and so i only rode him for half an hour and my instructor started checking all these things to make sure he was alright. then on thursday i had my lesson and he only took one ouch step for the whole time . and we had him going in tight trot circles etc. then on friday we were doing a group jumping thing and i noticed he took a lot of ouch steps but i couldn't exactly tell because it was on the foot i went down on the post. so i asked everyone to observe him and they said yeah he is slightly lame, he was bobbing his head so i put him away and didn't jump. then today i came took him from his muddy pasture and got him in a nice dry stall, and put some iodine on his hoof. tomorrow i will also give him the day off maybe walk him around a little. so when should i attempt to ride and see if he isn't lame? and how often to use the iodine? also i heard that if the farrier cuts your horse too short they will get red. and his toe has a faint red line. and this only came after she started trimming. so is this farrier related or no, it didn't happen for a week after she trimmed? and also should she be hitting my hose with a rasp? he is mouthy but i mean with the rasp? thanks for the help :) sorry for the longness and 20 million questions.