I've done two sets, and both needed a while to finally seal. The first pair was with tubeless ready rims and tires- one held air fine even with no sealant, while the other only took a couple of days before it held well. The second set was with iPlay hookless rims and tubeless ready tires- those took at least a week to hold pressure overnight, and one wheel had a slow leak for even longer, but they eventually formed a good seal and have worked well. No flats at all, but I did have to pump up the front a bit on the first ride after I skidded it through a corner and burped it.
What pressure are you getting them up to? A higher pressure may help to get everything seated, and flatten out any wrinkles.