Turn signal back feed

[Overkill]

Hello! Whenever one of the turn signals is on, the other one (in the front only), will also flash but very little - like a back feed. The rears work perfectly. Here is what I have done so far:

1 Checked front turn signal bulbs - they are the original factory and work in both turn and marker settings.
2 Pulled and cleaned the turn signal switch with contact cleaner - no change
3 Changed battery with another fully charged battery - no change
4 Pulled the tank and side covers and cleaned, checked and lubricated every connection on the bike including in the headlight bucket - no change
5 Replaced the turn signal relay ($80 - ouch) - no change

Modifications to date: Added winshield (had to make brackets to get it to hold perfectly still), drilled the pilot jet very slightly and shimmed the needle. The bike runs excelent! The turn signal thing is driving me crazy though. It is not real bad, just enough to concern me. Thank you for any help you can give me!