Thanks for chiming in guys!! Two things jump out at me right away.. 1) I will have to read the AMA guidelines, but I am not the that a Byron F-18 fails under the guise of large model aircraft. That being said, 2) I am not planning on using the Byron linkages for this plane. I am purchasing the mechanisms pivot bearings , rods and servo mount assemblies, and hoping to actuate the stabs like most of the newer style kits like Jet Legend, Skymaster, etc. This why I suspected from articles on RC Groups that the pivot might need to be moved. Moving the pivot to the 23 % point will leave this stab VERY heavy at the rear. Which could require lots of weight to static balance and as the structure involved here is Byro foam could get difficult to encapsulate. I am sure I am not done with this adventure at this point. This all comes to bear because of modern EDF motors and fans producing much more thrust than this kit was ever set up for. Just trying to be safe and not wipeout all my work on this conversion!!
Regards, Roger