Basically yes.
I wouldn't advise you limiting your Syns between now and WI because you've obviously felt deprived of something and that's what likely lead to the binge.
I would start fresh today as you said, and go back to having 5-15 Syns each day.
It may not lead to a loss on your next WI, but you've at least got back on track and that's the first step
And who knows, if you load up the speed foods, you may even get a loss next week
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