I have the Dunbar full-size as well, very solid and consistent.

One suggestion I have that might be a little unusual is to practice along with a keyboard if you can. Use the sustain pedal to play your drone note so you'll know if you're practicing is off pitch. Just remember that the "A" drone of pipes is actually "Bb" for some reason!

I finally got a pipes practice book the other day too. That's the first time I've ever seen a 4-note grace note before a beat!! Can you really still call them grace notes if there's more of them than the real notes of the melody?!

Oh, and save your yogurt cups! You can cut them up to make replacement chanter reeds!