Here is one more tip I wish I was told earlier on in my track riding.
When you catch up to traffic and rules prevent a pass, use that time very wisely. You're going slower than you normally would right? Then why aren't your throttle control, lines and apex's perfect during those times? What else are you thinking about...?
Many riders cruise through hot pit slowly to get clear track, but all those half laps start to add up to a lot of wasted time. Feel me?