[Lurkable]

I have 370cc sr injectors in my non-turbo motor. To adjust fuel to stock as if I was using 270cc's, I know the settings should be -27% for all RPMs. My question is, should the actual settings on the AFC be - or +?
I've been having troubles with my motor, and in it's current state, it runs crappy as hell at -27%, much better at 0%, and even better at +50%.

I'm afraid to test drive the car before I get the settings right, because it's a brand new motor and I want to know things are straight before I break it in. Another point of interest - the motor has 8.5:1 pistons because I was planning on turboing it. This effectively increases displacement, does it not? And if so, I assume, wether the settings should be + or -, they should also be greater than or less than +/-27%.

Can anyone offer me any advice on this? I'd really appreciate it, thanks!

Sorry, I know there's alot of information out there about the SAFC but I feel like I've read it all before. I learned alot first, and I was positive that I understood what I was doing by the time I went to install the unit in my harness.
I do know 100% that the I installed the SAFC correctly, it's been checked by multiple people. (The instructions are pretty easy to understand anyway).

I just feel kinda at a loss here. I can only hope that someone here has had similar problems. I'm going to visit my car tomorrow night to hopefully hook up some smog equipment and see just how dirty rich it's running. Any information I could take with me would be greatly appreciated. Again, thanks in advance for any help!