Sure, that sounds a little like constriction to me – I’d say get yourself to an Estill course so that you can work out what to change in yourself! Often it’s easier to see it in other people than in your own voice!
I use BookFresh, but I wouldn’t recommend it. Not enough options and a bit lame overall. I basically went for it because the woman endorsing it had an amazing name: Jenny Clevidence. http://www.bookfresh.com
Absolutely and completely normal! I was worried about that too when I started out – but some students can only commit for one or two lessons for financial or personal reasons. It’s the terrain! But if most of your students are staying with you for more you’re definitely doing something right!