Phenylephrine testing gives asymmetrical result in bilateral ptosis. Is this a contraindication for undergoing Mullerectomy?

I have mild bilateral ptosis giving me a tired look that I'd like to correct. An oculoplastic surgeon suggested doing an MMCR and gave me Iopidine drops for testing. Although both eyes respond, my left eye always seems to respond a bit more giving me an asymmetrical look. The in-office phenylephrine test gave the same results. Is this a contraindication for doing the procedure? The surgeon still suggested doing the MMCR (8mm on both sides) despite the asymmetry.