Not sure if this is related but tried F@H and Titan V vs Titan X (Pascal) are giving exactly the same performance results, similar with what you’re measuring vs 1080ti. The V is not boosting, but X is. The V is using just 40% TDP while the X is at 80%. The X is actually reaching thermal limit as it’s at the top of 3 cards.
For me this seems like the V is having hidden potential, but the software is not optimized for it.