You might not be able to put much significance to self-reported problems with sucrose since the physiology of fructose malabsorption does not support the notion that sucrose can be much of a problem for individuals with FM. You can review the physiology of fructose and sucrose malabsorption in the reference below The authors say that "sucrose malabsorption is associated with sucraseisomaltase deficiency, a very rare congenital condition. It will not be considered any further in this review."
BTW - there are a few errors in the Nutrition Guide for Fructose Malabsorption. For example, there is no excess fructose in distilled vinegar, nuts, chick peas, etc which are in the try in moderation column. It looks like the author has mixed up some of the FODMAP stuff with soley FM problems.
Reference
Gibson, P. R., Newham, E., Barrett, J. S., Shepard, S. J. & Muir, J. G. Review article: fructose malabsorption and the bigger picture . Alimentary Pharmacology & Therapeutics 25, 349-363 (2007).
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