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What is your guide scope's angular resolution at that focal length? How many arc seconds of space does each pixel cover versus what it the minimum seeing error before a guide command is issued? For instance at 1500mm focal length into a Meade DSI I set error around 0.4 of a pixel in great seeing conditions to 0.7 in poor seeing before a guide pulse is issued. At 2350mm focal length I used 0.7 pixel before a guide pulse is issued in great seeing to 1.2 in poor seeing with that guide ccd.
Secondly how frequently does your screen update - I found 3 second captures seem to give me optimal results to avoid chasing the seeing (I expect any guide correction will be very small, infrequent ~ maybe every 20 seconds, random in RA or DEC).
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