From the information we have, rolling heavy with 1.5mm every week is almost definitely far too much. Microneedling clinics recommend at least 4 to 6 weeks between those treatments, and they want to get you through the door as often as possible. Even the hard rollers in the old thread didn't eventually go below 2 weeks.
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And we have to keep in mind that our goal is not skin rejuvenation per se, but treating Androgenetic Alopecia. The Follica idea of deep wounding with manipulation of the wounding process with fgf9 to prevent it going into scar formation is not what we're doing with microneedling. Ripping your head up every 7 days and feeling like you've just put a good session in at the gym is not how you should be thinking about this. That could be like doing heavy deadlifts everyday thinking you're going to get ripped when you're more likely going to get fucked.
Also, it could be microneedling works more like shorting a circuit that tricks the healing process into action
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"When a medical grade, non-traumatic microneedle, preferably made from stainless steel, enters the SC and is pushed into the electrolyte of the intercellular space, the only possible reaction is a short circuit of the endogenous electric fields"
"Non-traumatic microneedles with a preferable tip radius of not more than 2–3 μm do not create a classical wound that bleeds."
"Figuratively speaking, an ordinary hypodermic needle merely “pushes” cells aside. In a classical wound usually bleeding occurs from punctured or cut vessels. In contrast during microneedling there is minimal to no bleeding since only capillaries are punctured. Never-the-less, the mild trauma to the skin results in a mild inflammatory response, likely due to bradykinins and histamine release from mast cells."
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