96blksc300

OK fellas. Just went single on my aristo swapped sc3. I'm on the aristl ecu, harness, and injectors. Using a stealth 340 pump. I expected the stock ecu to be able to control the single setup on low boost (10psi) as I have read nervous times of ppl running single on stock GTE ecus. Not in my case lol. Car is still running 14-15 afrs in boost. I only took it to 6 psi and let out. Not sure what the problem is as the car ran on bpu and 14 psi fine for a year. Now I'm looking into tuning options but not sure what would be beat for my setup. As stated before I'm using the aristo ecu and harness and I'm auto. Don't need any antilag or anything like that just fuel and timing control that will work with the auto. Map ecu? Aem? Emanage ultimate? I know the difference between piggyback and stand alone... Just not sure what my best option would be for a low power auto aristo (450-475)
Thanks