Upsizing anchor - suggestions?

[soopad00pa]

Old Catalina 30 with a 10kg rocna + 20ft chain + a couple hundred feet of nylon. On east coast of FL but expect to see action in the Bahamas and at least up to the Chesapeake, hopefully farther north.

The rocna has dragged on me once (sandy mud, 6:1) out of a handful of times out, but i am a noob so likely a technique/spot selection error. Still, I'm looking for better sleep and so plan to go up a size and add more chain.

Watched a buncha Steve's vids and am inclined toward the vulcan, but if someone has a vintage 10lb CQR they're looking to get rid of...

In all seriousness, readily available to me are 15k rocna, 12k,15k vulcan, and various deltas and claws. Worth goin for the 15k vulcan? Other ideas?