I'm really glad I didn't dampen your enthusiasm of Cream of Sask, because just like you said, it may sweeten up a little more for you AND you might like it better than I did even if it doesn't. Actually, one of the white ones I have grown were a little sweater than the others, and I hate to admit it but I've forgotten which one that is- so maybe it was C or S.
I had forgotten how far north you are! No wonder you folks get so excited by a watermelon! It looks like you'll get some this year (not to jinx you!). Out of curiousity, when does the last frost usually come and when does your first frost of the fall usually hit? (I understand these will just be general estimates)
By the way, here are some taste test ratings and Brix numbers from a study done of Univ. of Washington. My guess is these would vary grately from year to year so I'm not sure how meaningful they are, but its still fun to read. You'll see Cream of Sask isn't rated terribly low, so others like it better than me!