I am not convinced that using the homemade (HM) carb tuners are accurate. I know, I know, fluid in a tube and all that....
My premise is the sensitivity of the HM tuners is the problem. They are too sensitive even with typical dampening. Hook up some regular vacuum gauges without dampening (humor me) and notice how wildly the gauges fluctuate. Now dampen them with some sort of restriction and notice that they still fluctuate wildly, just not as much.
To accurately balance these carbs, I've found that you need to severely restrict the input to whatever metering device you are you using. Steel rods/mercury/fluid all work as long as you restrict them appropriately!
