oh i solved the problem alright. i went out to the job, cut the PAR 36 fixture out of there and installed a Kichler LED 35 degree spot. then i left, got up to 45 MPH and threw that PAR 36 out of my passenger side window.
for the life of me, i cant figure why anyone in their right mind would install incandescant fixtures anymore. i, for one, will no longer be held hostage by their ridiculous sensitivity to voltage fluctuations, connections, etc.
it's all LED now, or i pass on the job. word.