I hope that this doesn't spawn any gaff-rigged lasers. I've helmed a Wayfarer in a good blow and that's much worse. It had been re-rigged from gaff to bermudian at one stage, so maybe that was the reason, though I can't think why. I'm sure that must be significant. The trim is also significant.
Weather helm is reduced by keeping the weight well back.
I'm not sure about mast rake. Mine is almost exactly vertical. The other thing is how tight you sheet the mizzen. My mizzen is cut dead flat and I harden up the snotter to keep it as flat as possible. Close hauled in a force 2-3 it's possible to lash the helm and let her take care of herself for quite long periods.