Hmmm. Fair point about the variance issues. That said, if you set static defenses and modifiers within the range you expect to see then that still should be manageable. As an example, if your defenses are normally, say, the equivalent of rolling 3 on each die, then a +6 is still a respectable addition unless you normally expect really wide ranges of dice at either end. I mean, honestly, I'd expect that if you're running around with 8D combat skills and fighting people with 4D combat skills, they're mostly going to be speed bumps anyway. If you still want some variance something like an open ended Wild Die will produce it while simplifying the combat exchange for people who don't like two-ended combat result (i.e. attack rolls versus defense rolls). (I'm not bothered by it being an old BRP hand, but I know it bothers a lot of people for--reasons).