Phil and
, Tracking as you put it at high magnification is just a little bit more difficult than at lower power with a Dob, but it is a skill you can only achieve with experience .
As you learn to controll the scope and use higher mag the easier it gets
Jupiter for instance will move quite quickly through a 13mm eyepiece in a 40cm scope with a magnification of x140,smaller objects like faint galaxies hang around a little bit longer.
One of the tricks is to get wide field eyepieces
Cheers
