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You cannot modify the tune if you don't have the tools, so for now don't touch it. If it was made for these exact AFM and injectors, it should be ok.
The thing is, when recirculated, a discharge valve still leaks; but it does not matter, as the air that goes through has also gone through the MAF.
A pop at idle can really be tons of things, from a little too lean fuel map, worn sparkplugs or wrong gap, an exhaust leak, worn valves ... .28/.30 should be ok for spark plug gap though. Maybe you can try a colder index for the spark plugs, but i would not worry too much if i were you.
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