[Whaler]

Hi I am totally taking a stab at this.

Is this the first time you have had the car out for a road test and long enough to generate a little heat? I note you say you have 100 miles on it. But this is the first time this has happened?

If so is there a chance the brake masters or lines feeding the masters or the lines out have got hot?

Is there shielding in the brake and tubing areas to protect from header heat?

Also as you said, the car was labouring...I would guess that's because it was actually braking. Therefore the smoke. Hope it wasn't hot enough to warp the rotors. Just thinking that if the heat in the engine bay could have caused the fluid to expand creating braking force. But this seems too extreme.
Actually hot fluid is supposed to cause brakes to fade doen't it?
Sure its not the e-brake sticking? I assume your calipers are floating freely on the slides?

Hard to guess without being there to see this and troubleshoot it methodically

Tim