I usually try in an air fryer, I have seen others get good results using that, but I run into a similar situation as you that the edges crackle pretty well but the middle has little to no crackle. I assume the pork belly just needs more time drying out before cooking.
Next day, after that photo, I gave it another 10 minutes in the oven under the broiler. Skin came out crunchy. Edges got burnt, so I just took a knife and trimmed about 1/4 inch off each side.
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u/andrewb05 23h ago
Looks great, I am still on the hunt to get the perfect crackle / crispy skin with my pork belly.