Thanks both of you, that's useful.
Gripping too hard during pull ups can definitely limit your performance. Tension in all the wrong places.
I trained in a place for a while that had a bar on top of the power rack with incredibly aggressive knurling. I found sets of 5 muscle ups relatively easy at the time but it would be bye bye hands afterwards and bye bye pretty much anything like deadlifts until they healed.
I was absolutely shattered this weekend so I'm leaning towards me being generally smashed last week.
The rationale for reduced gin intake and the knowledge of the perils of alcoholism and attendant metabolic derangement has almost entirely come from physicians and researchers.