Interesting... I use between a 52% and 58% depending on which flours I use. Are you sure you aren't confusing the soft start with struggling? Even partially kneaded when I stop and restart it picks up just fine, other than the soft start.
Generally when I am making general purpose bread I do about 8 cups of flour, I haven't pushed up to the limit of the machine (listed at 14 cups) as that would be more than I can handle at one time. The oven is only so big.