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There is really no such thing as a max payload for astrophotography for any mount. You will get many opinions. It depends mostly upon what guiding accuracy you require from your mount. Some people obsess about getting guiding figures that gain them nothing, because their present figures are already providing round stars. Some people err on the side of caution, afraid that they might overload their mount, which is mechanically difficult to do, the limiting factor on most mounts is the motors. Your HEQ5 will take your Williams Optics 91 plus all the required ancilliary equipment with no problems.
One well known APer is using a 12"Newt on his HEQ5. The notion that moving
up to an EQ6 for example, will reduce the effect that the wind has on your scope is debatable. If you have an 8" Newt on your mount, you'd need an EQ8
to markedly reduce wind induced vibrations.
I've been in this hobby for over 70 yrs, and have seen people using all sorts
of seemingly preposterous setups, some more successfully than others.
raymo
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