Cletis,
Believe me I have cooked my brain on this one.
I have wired many cars but this is a first.My theory,the relay does only have one power source until the brake switch is energized thus power is at both 87 from the turn signal and 87a the brake trying to both send to the 30 (common).I think the blinker isn't strong enough,so maybe the electronic one will fix it???? Will work on it this weekend somemore.