The hardest part of getting back in shape is getting started. Once you get started you feel so much better about yourself that it keeps you motivated. It becomes a perpetual cycle. Conversely, a few days off in a row can lead to weeks, months and years. Might be exagerating a bit, but not much.
Sounds like you have conquered the hardest part, getting started. Keep it up, it's all good.
I am large framed, never got nearly as large as you, but have gone through periods of months to up to a year of sloth and inactivity, but even now though I work out every day and ride 5,000km a year in short Canadian season and have done this for years now (5-6 days a week) my weight does not change much. Could lose 10 pounds and would definitely climb hills better, would probably lower my BP and cholesterol, but the weight stays about the same. I feel great though and that's what matters.
You are definitely on the right track.