I've had my first two practices this year after nearly a month off.... they were awful! I'm shocked by the degree of lost coordination and number of bad habits which have reappeared.
Although it has been a very frustrating week, it's been a case of regrouping and going though the basics again. Salmon and O'Sullivan Senseis noted that my back foot has started twisting out and I was stepping too high with my right foot (planting it too short). I was working on this during thursday practice to try and fix my footwork.
O'Sullivan Sensei retaught us 'floating front foot' for fumakomi. We were told to move our body weight to 55% on the back foot, enough to keep your front foot mobile. During the push with the back foot/leg/hips the front foot shouldn't be raised more than 2-3 inches above the floor if possible, the 'stomp' sound will come naturally. Other senseis have described the front foot to me as a stone skipping over water.