Disclaimer: I didn't read page 2, so I am not sure if I will repeat what's already said.

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According to some thrust calculator out there, static thrust is not affected by prop pitch. (I am not sure if I agree). But let's say we assume that static thrust is not reduced by lowering pitch, then 18x8 and 18x6 will hover the same plane at the same rpm, say 5000. But we know that 18x8 @ 5000 corresponds to a higher throttle setting than 18x6 @ 5000, so the throttle stick for hovering will be lower for 18x6. Now, TR. We've previously established that for same diameter and same rpm, a higher pitch will have more torque. So, 18x8 @ 5000 will generate more torque than 18x6 @ 5000, if both are hovering. Therefore, 18x6 will torque roll slower due to lower torque at hovering rpm.