Running Lean But Not Mean, Carb Help... Options

[somd914]

So it's been a while with a hectic work schedule since spring and a move over the summer. Finally back to the 914... Forgot how much fun she can be. (IMG:style_emoticons/default/smile.gif)

I left off last spring fighting a stumble with pulling away and with partial throttle acceleration.

My engine is a 2056, weber 40 IDFs running 28 vent, 130 main, 50 idle, F11 emulsion. Timing is set for 27 deg at 3500, Pertronix SVDA dizzy (had an 009 with worse results), Webcam 86b cam, stock heads.

I installed an AEM A/F gauge last weekend - numbers look decent with idle, wide open, cruise (most of the time), but partial throttle (perhaps 1/4 - 1/3 pedal travel) leans out to 15-17 and stays there until cruise I can throttle back or open the throttle up. While cruising slight increases in throttle for a hill or small speed increase leans out from 12.5-13.5 range to 15-17 and stays there once again until I can throttle back or open up more. Seems to be dependent on throttle position, not RPM.

Carbs are synched using a snail gauge checking at idle, 2,000 RPM and 3,000 RPM.

Any thoughts/guidance from the carb gurus out there?

Thanks!