Yeah, definitely just leave it. You probably shouldn't have that heater belt on it if you used a lager yeast. I can't imagine your house being colder than what most lager yeasts want.
One thing though. This phrase bothers me: "its not far off the bottle band on my gravomitor."
I'm assuming a gravomitor is a density measuring device which most of us would call a hydrometer. What scares me is that you seem to be talking about a band on it that's been marked where you intend to automatically bottle it. Really, your final gravity will depend heavily on the recipe and the type of yeast used. When you think it's done, measure the gravity for 3 days running and if it doesn't change, then you are done.