Your understanding is incorrect. There is no "entire power". That's the point. The ONLY power involved at all is Poison; everything else is just the stuff the Ring allows a character to do. That other stuff isn't a power, it isn't an ability... it is just what the relic does.

The Clones can only use powers Lobo can use. They can't use anything else that happens to be affecting him. Or would also cut their speed values in half if Lobo himself occupies hindering terrain and they do not?

Obviously you are entitled to hold an opinion but it doesn't mean you are correct If you read the links that Normalview included in his previous answer the WES have ruled on Triplicate Girl who grants powers to her POGs in the same way that Lobo does to his.