Buy a better helmet, or at least one better suited for your riding style.
One of my helmets feels like its been caught by a skyhook as soon as I hit 100mph,massive strain on my head, Yet I have another that sits firm and comfortable at speeds well in excess of that figure.
I don't do much "tucking in", being a fat bastard with a penchant for naked bikes and sitting on a bike rather then lying on it.
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