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The truth about the Factory Pro kit is that you're really only buying the needles! The jets are under $5 US and available from several sources, so they're not what you're really paying for.
Anyhow, a 12.7:1 ratio is the theoretical ideal for max power but you're not going to see as much of a difference between 12:1 and 13.5:1 as you might expect -- the response to mixture is somewhat like a bell curve. If you can get the entire fuel curve to run within the range of 12:1 to 13:1 you'll be doing very well.
15:1 is a bit dry for performance and you'll definately feel a difference between that and a 12.7:1 setting, but you'll find that there's more power loss for a rich mixture than a lean mixture of the same deviation.
The change in torque with the new cams shouldn't be a big surprise. The torque potential of the engine is set by the compression ratio and mixture ratio, but it's the volumetric efficiency of the intake and exhaust that determine whether that potential is realized.
Jim
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