I think the reality of cushcore is that it's harder for the sealant to get everywhere. I use double the sealant I used before and I reapply more often.
We have been seeing a higher than expected rate of loss of seal with tubeless tires that have cushcores installed. We suspect that perhaps the goop isn't getting between the cushcore and the rim in sufficient volume to seal as effectively as it should. Does anyone have any experience with this...
I have to make myself ride mine, and my goal is to ride it one day a week. Some weeks twice, but more likely not at all..... However having it there keeps me honest and gives me a basis in reality. Plus it's an awesome bike.