The EQ6 is rated up to 18.2 kg so it has a pretty good carrying capacity (slightly more than a Losmandy GM8 but less than the G11) and the 10", an 80ED plus camera and ancillary equipment will be pushing the limit (work with about 50%-60% of load for imaging) but there is a caveat here in that the lengths of the SCT and Orion are very short so there is much less lever arm movement than with a long reflector or refractor. I work right up to the limit with my GM8 with np and I believe it's the compactness of the ota combination that allows me to do this.
As for the focal reducers, you will increase your field of view so stars should look smaller and sharper anyway, plus if you have one designed for your OTA (ie an SCT FR for the SCT) then you should end up with a flatter and more usable imaging field. I'm still experimening using the SCT FR on the Orion atm but it looks promising.
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