Eh, I find that if I start taking "days off" from secondary writing it usually just turns into a multi-day procrastination-fest.
Try taking care of stuff that's less enjoyable than your secondaries. I'm an enormous procrastinator, and my usual excuse for putting off working on mine is usually some other obligation that I could be tending to (Writing papers/researching usually works well). Eventually I'll start looking for a way to put that off too though, and wind up switching back to secondary writing as a "break".
I dunno if that's horrible or not, but it works for me...