I have not been on this thread for some time.
I have switched from the steel braided line off the exhaust for the e-vac and I am disappointed in myself for not seeing how much of a nightmare that was going to become.
Here is my new e-vac setup.
Once I changed over to this setup the transition from vacuum to boost actually become much faster and the car pulled much harder simply from the great increase in flow.
NOT saying it gained power, but feels stronger.