Jake post up a pic of the underside of the piston.
With the ignition the stock advance is only about 20-22 degrees at lower rpm from memory. There's room to go higher by a 2-3 degrees but then as the curve retards in the higher rpm you'll be left with a little too much advance, should still be safe with correct squish, etc but you'll lose a little top end and over rev. Have a play going from +2 to -2 and see how it feels with the mods you've got. There's no single best curve, it's all relative to the individual setup. That's why programmable ignitions are so good cause you can set it exactly how you need it.
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