Yeah, good point on the protein levels. I have found that hydration plays a huge role in terms of how your protein workups show in your urine screens.
The creatine levels are usually high because I'm usually a vegetarian, so I tend to go through adding some creatine in my shakes (cycle through them). I think on that particular day, I was perhaps a little less hydrated than I should have been, resulting in higher levels than usual. In any event, I know I'm over-saturated with creatine and need hydration when I start having cramps.
And you're right about see-sawing on fitness. I don't necessarily see-saw per se, but I do go through bulk and cut periods (i.e., winter and summer). And so at the peak of a cut with lots of active workouts thrown in, my resting heart rate is lower. At the peak of my bulk with almost only weight exercises thrown in (usually around the winter holidays), my resting heart rate is higher. It's a good thing I can wear sweaters then to cover up my fatceps.