I don't really get how this is a problem since there's pretty simple solution.
Just set your goals to what you want to have as a minimum on an off-day, then on the days you work out you aim for the 200%, 300% or maybe even 400% award.
Mine is set to something achievable even on my off days, but not so low that I'll achieve my goal by laying on the couch all day. Simply because I want to at least move a certain amount even though I'm not working out.