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Hi Mark, I am using a side by side set-up with 100mm refractor and 160mm astrograph and it works well. If the set-up goes too wide it will limit your viewing near the zenith as the scopes can hit on the mount. You may not have a real problem with what you are trying. I did try a 14" SCT with 100mm refractor on one side and the 160mm astrograph on the other; this did limit my views of the zenith. From my experience side by side is more stable than piggy back.
All the best.
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