Hello Jim,
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It is my belief that yes you will be pushing the mount, the G11G,? you could be taxing the G11T also though not as bad.? I'm assuming that there is a dew shield involved too.? Either mount you will need the FHD tripod or one of those tripiers.? Stability starts at ground level, always.?? Also I'm assuming the scope is on a Losmandy bar, my opinion a cradle would be better but surely put you over the top.? Guiding should also be done with an OAG or ONAG, my opinion too.
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That was at F10,? at F6.3 you should be better.
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I had a C14 with a Homeyer cradle and a G11T, but I was visual and planetary.? That was three years ago, don't have the scope and my Neighbor has the mount.
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Joe