The hybrid system works good with OEM wastegates. But typically people do it to be able to turn up the boost without a lap top or tuner present. And really...... who out there is going to tun boost up 1 or 2psi, nobody! Its a bad idea. A MBC alone is quite acurate and doent cause spiking like a EBC does.
An EWG works so well compared to a OEM IWG its not even comparable. Ditch one of them. Listen to youre tuner who said "you dont need one", I dont know why he didnt say thats just useless lol.
So back to the topic. Go to this link if you want a correct routing for an EWG. If you still want to add the second Manual controller...... you need to add it in line between the compressor housing and the EBC. If you dont have Adobe pdf, download it to view the link. The routing starts on page 6