How is your Neptune drilled?
I ask because the Nep seems to have 2 different personalities: one when drilled with a high, long pin and one with a lower, closer pin.
If yours is 5" or more, pin-PAP, with pin above the bridge area, try a pin at or below the bridge level with a 3.5" pin to PAP.
Also, you can adjust the surface of the Neptune. Try sanding it to 4000 grit and leaving it matte, OR sand it to about 800 or 1000 grit and pt just a light coat of polish on it. Like most resins, it repsonds to cover changes.
Otherwise the Venus is the next step up from the Neptune, but beware, this is a devastating ball. Once you get one, you may want to get another with another drill. An alternative to the Venus is a polished Pluto.
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