Changing the clevis hooks on my safety chains

Reguardless of what you decide for attaching your hooks, I'd refrain from twisting the chain to take up slack. If you ever need the chain to do it's intended job, twisting can potentially weaken it. I'm not understanding how the chains can be too long and that's a problem. cut a link out if they're too long. Use these if they're too short. Although, probably cheaper to just buy a longer chain!