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I think they are all wired "backwards" it is fairly well known that a regular LED lamp will not work as a turn signal indicator.

You do understand that the LED lights have a separate ground wire unlike the incandescent lights that ground through the mounts yes? the front turn signals might be seeking ground through the "parking" lamps which are powered removing that path when the headlights are on...

Sounds like you have a grounding issue to the front end to me, like the front turn signals are grounding through the head lights so when thay are on the path to ground is not there. weird!

That is what I do not understand, this should have NOTHING to do with the headlights, also when you switch to left or right turn signal the front and rear bulbs should do exactly the same thing, burn, flash or not as the turn signal switch has them tied together, makes no sense the rear would...

Did you try putting some load resistors on the rear lights so "simulate" standard bulbs, it probably would not take the full current an incandescent bulb would draw to work. For example a 50 ohm 25W resistor would draw only about .5A which might be enough to make the circuit work, or maybe even...