Take a look at your copy of the repair order and see if they changed the clutch spring. If they didn't, perhaps they should have.
I don't exactly follow the BS they told you about the oil soaking into the clutch plates and causing them to swell, which caused them to wear out prematurely. If the plates swell, they would drag, not slip. And the fact that your clutch is slipping within a few hundred miles of their "repair" tells me they didn't find or fix the root cause of your problem. In other words, your service department is FOS. Big surprise.
Here's just a thought, with no data to support it other than a feeling based on all the other screwups from H-D that we actually do know about. The only difference in the clutch for a regular bike and a CVO is the spring. Does anyone suppose, knowing how H-D does things, that they might just put the wrong clutch spring in some of these bikes? My answer to that is, does a bear crap in the woods?
BTW, as noted previously, the Harley clutch is marginal at best if you increase torque much from stock. The clutch with the heavy duty spring is only rated for 125 ft-lbs at the crank if I remember correctly, and Harley claims 115 ft-lbs at the crank stock. Now, if they install the standard spring instead of the heavy duty spring, you can imagine the result.
I assume you plan to take the bike back and have a word with the aces at the dealership. Let us know what kind of story they come up with this time.
Jerry
Oh, one other thought. Check your hydraulic fluid level and make sure it isn't over full. Too much fluid can keep the clutch piston from returning completely, and the effect would be similar to riding the clutch in a car.