I'm using 4.6 at that COL length with the same bullet and getting 1060 fps from my Glock 19. WWB chronos 1160 fps to give you an idea of where you are in relation to factory.
You have a little more room to bump up the charge to get the accuracy you seek, Hodgdon says 5.1 grains is max for this bullet weight and powder combo.
BTW W231/HP-38 is fine for this bullet weight in 9mm.
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