I would be more inclined to believe that with an electic fuel pump you need a bigger jet for more volume due to the lack of volume the pump delievers. Have you ever ran a mechanical pump with your set-up. Years ago i bought an alcohol carb from Barely Grant. I had a Barry Grant pump and they told me it wouldnt work and they were right. Have had a mechanical pump every since. I do not believe you need that bid of jet with an Enderle pump.
Zipper, where are you i need you to jump in here !!