Would it work for you to eat the large slices of roll in two bites, or does that also lead to disarray? I try to have the band of nori face me and squeeze it a bit while taking the first bite; that way, teeth have the best chance of piercing and separating the part that's (usually) hardest to chew, the nori itself. Bit fiddly for chopsticks to orient the sliced roll that way, I admit.