What range does Spark give you? The 1800 calories seems ridiculously low to me (as in, low enough to cause a drop in your metabolism), and I would think somewhere around 2150 - 2500 per day would be more reasonable.
Realistically, you are almost at your goal weight, so using the loss goal of 3% of "need to lose" per week, you are looking at around 1/4 lb per week right now, or 1 lb per month.
What you might want to do is set up your Spark range based on the 1 lb per month loss goal, and see what the range is based on 2500 calories of exercise and then set it again using the 6000 calories of exercise and see what the difference is. You can then decide what range makes sense to you and leave it there.
Personally, I don't worry about eating at the exact same level all the time, as I prefer to go by my hunger cues. If I have a week where I am that much more active, I will be more hungry, and I will eat more to fuel my expenditure. As long as I'm maintaining the calorie differential, then I don't bother changing the ranges in the tracker and ignore the fact that I'm over the "limit" for the day or week.
Good luck figuring out what will work best for you!
Start weight: 240 lbs
Goal weight: 155 lbs (reached March 7, 2014)
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Colonoscopies allow polyps to be removed before they can become cancer, or let cancers be found before they are too widespread. If you are 50 or older, or have any symptoms, please don't let fear stop you from covering your butt.
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