For me chutney's should be vinegary, it's one of the defining characteristics of the preserve. If you want it less vinegary though, diluting it should work. This can be done by adding more of the other ingredients, cranberries, sugar etc.

I made some apple chutney that was too vinegary - well beyond the balance of a good chutney, to the point of drowning the flavors of the spices, apples, etc. I rescued it by making another batch, cooked down with water instead of vinegar, and combined. It worked.