The Cadence of Death node states that it provides a 20% more damage modifier (not restricted to melee or bow damage) so I would expect it to also affect the bleeds applied by Puncture, but this is not happening. I’m getting ~19 damage per tick on all hits from Puncture regardless of whether I have the Cadence of Death node allocated or not.
I tested with exactly 100% bleed chance & waited for the bleeds to finish before attacking for a second time.