Engine missing at 5500 rpm

Prior to first flight I had been having some difficulty with carb vibration and subsequent fuel venting and one of the things I had tried to reduce fuel venting was to readjust the float level settings by bending the armature tab that the float valve interfaces with.  At the time that adjustment caused more closing force on the float valve and that did reduce the fuel venting, while maintaining an acceptable fuel level in the bowls, as evidenced by bowl removal after operation and measuring the fuel level in each bowl.  Since then I have done a successful P-Sync on the carbs and have eliminated the carb vibration and any fuel venting.  However, to date I have not readjusted the float valve armature back to the factory level setting.  

During my recent 1st flight the engine ran great at reduced power settings but would misfire for a few seconds on climb out at 5500rpm and above and then come back strong for a few seconds.  This cycle of missing, then coming back repeated until the power was pulled back during the downwind leg while in the traffic pattern.  With reduced power setting during descent the engine ran fine.  The fuel was checked for water contamination before and after flight and none was found.  The plugs were checked and were the normal tan color.  Ambient temp was 70F.

After the flight it occurred to me that the engine missing was most likely due to the float valve armature not being set to the recommended location.  I plan to return it to the proper setting before my next flight.  I have seen a 10 year old post in this forum that describes the float valve armature setting as 0.412" from the carb bowl "edge" to the the top of the metal float arm.  I am confused about where this "edge" dimension is taken from on the carb body and if it is still a valid dimension.  Can someone clarify this dimension for me?  Also, can someone confirm my suspicion that this float valve setting is the most likely cause of the engine missing condition I experienced in flight.  Thank you in advance for any insights you may have to share.