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1st problem is spray pattern and effect. It will spray nothing like the 270cc injectors did no matter what the pulse width is. It won't atomize your air and fuel properlly.
2nd stock compression isn't high enough to crunch enough air for the type of ratio you are looking for.
3rd I'm betting that timing is advanced which will throw off the ignition timing and fuel maps you probably need to lean out more than -27 IMO, stock tune increases richness (HC) the hotter cylinder temps become with advanced timing.
4th why are you even attempting it without a wideband o2, not smart IMO.
5th reason using a stock KA maf and stock ecu tune is getting you no where.
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