I put my William Optics 72FD on an 8SE mount a few time when I had it.
I guess the Skywatcher is a smaller and lighter than the default tube, so I guess it should be ok. As others have mentioned, Zenith might be an issue, but it's an issue with the default tube anyway if you use 2" accessories.
Balance is a bit of a compromise between seeing Zenith (sliding the tube forwards) and nice balance. I wouldn't add any more weight to improve the balance - it's already at it's limit.
James
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