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Flexure is inevitable Jim. You cannot eliminate it altogether. You can lessen it more and more but if you intend on doing deep subs such as 20-30 minutes or more then you will find at some point up to that 30 minute mark you will see it creeping in. The best way to test for flexure is take a shot at 1 minute, then 5 minutes, then 10, then 15, then 20 and then 25 minutes. You will see elongation in star shapes over the entire frame at some point and it will get worse with longer and longer subs. Making the system really rigid will help but things like focusors also have to be looked at too. Connections to cameras and the like also play a huge part. It will take quite a while to eliminate the flexure to an acceptable level. Your primary aim will be to get 10 minute subs without flexure and in your next of the woods I would be aiming for 20 minutes with the dark skies you possess.
The better solution is to use an AOG. Using this will help but you will also need to address mirror flop. As I understand it you are using an older C14 which does not have the mirror locks in place. You can make your own and install them to help with this problem too.
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