I think you need to eliminate cone error.
But if everything is right it seems to work to get you pretty close.
I have nights where I get so confused doing drift and you would think after all this time it would not happen but it does, time between shoots is a bit this year so that would not help.
I also take some shots on the horizon and above showing the drift left by a couple of exposures so I can look at it again the next day and figure if I was adjusting the correct knobs.
Best solution is to permanently mount the scope and mount (mount at least)so you finally dont have to worry about this part of setting up...I am nearly there and already life is better.
But you still need to finally drift align for real long runs.
alex
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