Is there a cavity back 60 degree wedge on the market?

60 degree lob wedge = blob wedge.

Unless you spend a lot of time practicing with it, I'm surprised that you are happy with 70% of your shots with it.

As far as I'm concerned, there are VERY few occasions where a blob wedge is needed. If your sand or pitching wedges work then use them. Leave the blob wedge at home and it will give you options to put another club in the bag.

I've yet to see a 12or higher h/capper consistently use a 60 degree well. Learn to use other options and your handicap will drop.