I find that when people start substituting, that's when it all starts going wrong
Please try not to. Tough when the head tells you that logically it should be no different (or even better with the lower carbs), but it doesn't work like that. Honest
I've tried to SS using Sero and it just doesnt work! As KD says, the nutrient content isnt the same. Have you tried warming the flapjacks up slightly? Or even thought about changing to Cambridge Diet, as the options are SO much better....