So, tried a R1 in an unweighted canoe the other weekend (took all the stuff out and moved it to the other end of the portage). The canoe was immediately noticeable as rocky.
Anyway, we did the R1 and I'm embarrassed to say that we hit a rock at an angle and depsite leaning into it somehow managManaged to drag the canoe full of water to the bank and reload it - glad it was a hot day!
Is it better to keep the canoes weighted for rapids to keep stability? Obviously, it's a balance between dunking your equipment and not.