I have my Eco-8 setup with low being between -3 and 0 degrees depending on the flight mode, mid stick being around +5 or 6 degrees, and top being around +10 or 11 degrees.

With a pitch range of -2 to +9, I don't think it would be very wise to have mid stick set at 0 degrees, seems to me that it would make the collective less precise (and more touchy) at anything above mid stick.

Whoever told you to set the mid stick at 0 degrees probobly flies 3d.