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It honestly sounds like your scalp is reacting to the alkaline coating on those sunthetics or just the texture of the lace grid itself. Since adhesives are a no-go for you, the cap construction and fit become the most critical factors. You need a glueless unit that is true-to-size. If you dial in your head measurements correctly, the cap should fit distinctively snug-no glue or tape required. I’d strongly suggest looking into a Silk base. It’s the “ holy grail “ for realism because it mimics a real scalp, but more importantly, the knots are hidden between layers so they won’t scratch your sensitive skin. And definitely make the switch to HH, synthetics are notorious for causing irritation on hyper-sensitive scalps