There's some room for improvement in the docks. It's possible to break all three boxes in two jumps from the springboard in the next-to-last section as shown here, but I never got that working consistently. Avoiding the extra jump saves ~1 second.

I also never really worked at optimizing the final section, so there's likely to be a better way to do that part, too. So I expect sub 1:20 is possible.