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None of my scopes have ever had baffles. Depends how much stray light you are talking about and how directional it is.
At f9, you can get away with a smaller tube but don't do too small or air flow convection currents with mess with your view and will continue through the night as the tube continues to cool. I'd recommend a normal tube diameter and just give the mirror some breathing space.
Extra length out front will help as will a single baffle at the front or maybe two, one at the front and one in front of the spider vanes.
If you have unidirectional strong light eg from a neighbour's outdoor light, a smaller tube won't help but a one sided tube hood will.
Joe
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