The only thing I didn't like about your build was your chain. lol
I had a 04/05 FCI for one dyno tune and one trip to sand mt. It was good on the dyno but only good a WOT at sand mt. I went to the dasa and was much happier. Very smooth a/f line and more overall power but 1/2 hp less at peak.
I went and looked at my dyno sheets I had a 210 in mine and was slightly lean, I remember we tried 3 different needles with the FCI and never got it perfect. Garett suggested a 06 intake or he offered to streach mine but the dasa was just to easy to tune.
Check your exhaust, sometimes when you crush the gasket then do heat cycles it can come loose and suck in cold air on decel causing the pop. Or the o ring on the af screw.
Also when you check your exhaust you might want to see if the crush gasket is interfering with the airflow, the oem gaskets will often flatten out enough to be smaller then your newly ported exhaust port.