Very cool pics. Can almost see the smile on your face from here. Track time is fun aye.
Definitely get yourself some race booties. They're generally quite a narrow width and sole (especially), so makes it easier for heel-toeing and a non-slip sole. That should help a lot. Also they're a lot more comfortable with the fastening points where they are and special lining, than driving in a normal shoe. Also try some proper driving gloves, improves your grip no end on the wheel, even on our leather wheels.