Some people need data. I've never understood that. I can look at a baby and tell, within weeks, how old they are. It's a natural gift. I'm a touchy feely person, I go by how I feel and how my clothes fit whether I'm losing or gaining weight. I've never owned a scale and won't allow one in my home. I've seen DSers beat themselves up because they aren't losing weight as fast as someone else did. Some people drop their weight like a brick. Some people float down gently like a feather. They still get there. Who says losing faster is better? It certainly is harder on your kidneys and liver, at the very least.
So weigh and chart if you feel compelled to, Brian. Just don't let an arbitrary number have control over your happiness. Don't let your charted "progress" distract you from the REALLY IMPORTANT things: hydration and protein.
Do you chart your hydration and protein? How about charting your labs on a spreadsheet? I bet you could really have some fun charting your D level and tracking your supplementation of each vitamin.