Get rid of the plough, doesn't matter whose it is or where it came from.
Go see that turkey Grant at Chains Ropes & Bondage or whatever they are called, and get the Crew discount!
Any of the high or super high holding power modern designs will deliver you to a new world of bliss when the wind comes up overnight.
We use Rocna's, Excel & Manson Supreme on various work boats, and the Sarca Excel on Bad Kitty, changed from a Rocna but only because it fits better without the roll bar.
Both excellent anchors. And don't scrimp on chain, I'd add 20% to what you think is ple