Hi AprilT, I can relate to simply not having the time to exercise. During my really busy times, I try to do what you do...load up on days I have more time. The thing that works best if I can make myself do it, though, is to try to get in two really good workouts (weekends) and then on at least three other days, at least do something brief, like just run a mile on the treadmill. In the past, I used to do a round of the 30-day-shred on busy days...it literally takes 20 minutes and it does produce results.
Hope you find the combination that works for you. Looking forward to seeing you on the forums!
And now that you don't have to be perfect, you can be good.