Sorry to hear that they give you blisters
I have non-patent cage flats, and they gave me pain in the beginning too, I had to stick in cushioning in the spots that rub and caused blisters. I used cushioning by Dr Scholls, I forgot what it's called but it looks like the pic below. It's a tape of cushioning that you can cut to size:
I will definitely look for this tape. I have now 3 patent high heeled, 1 pair kitten heel, 1 pair flats, and 3 pair of the lower heeled sandals. The 3 high heeled are patent and I do not get blisters, but then again I can not wear them for long.because of the high heel. My main problem is the patent flats, talk about misery with those blisters.
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Foot petals have a product called 'Pressure Pointz', which are tiny versions of the inserts that you can stick to problematic spots.
Best of luck in breaking-in your pair, don't lose hope! [emoji173]️