sounds like you have things under control. Keep persevering and you will get there. 6 hours is a lot of training if you are sitting on an overuse problem. If you find the symptoms settle when you rest for a few days it may be that 5 hours a day everyday is a bit too much. What about building some more recovery periods into your training - say training every second day of hard training one day less the next day and none the third day and cycle through that? Make a point of not taking more than two days off.

Pay attention to your body and you should be right - you only get one :-)