Instead of swearing all the parts are positively (PUUNN) good and installed perfectly by whatever mysterious angel a "certified Buell Tech" is.... and then swapping random used parts as a total guess by yourself...
Lets avoid that frustration, time, and expense, and start with the simplest clues to what could be going on.
How is the charging system behaving? (Theres a voltmeter on your dash board)
Should be 12.5V at rest. Any lower means to charge or replace your battery, I don't care if Pep Boys said its ok or not.
Above 9.6V while cranking. Any lower means to charge or replace your battery, I don't care if Pep Boys said its ok or not.
and between 13.5-14.7V at 2K RPM.
The test should take all of 10 seconds or less to perform. Give us a Clue, Blue!
*also: whats your idle speed?