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The idle dip is possibly the same issue that plagued many early owners with codes P00016-19 IIRC, cam sensor or something. You could call around to other dealerships to see if they'd be willing to investigate or fix it if its not throwing a code yet. Also, make sure your AC isn't on, the compressor engaging and disengaging will cause the idle to dodge, duck, dip, dive, and dodge.
The crickets are unfortunately a side effect of how current HPFPs work. Everyone has been told it's still perfectly functional, just noisy. It's something that affects a large number of manufacturers from what I gather, Mazda, Audi, etc. Why some owners have it more than others is unanswerable. Correlation between straight gasoline and ethanol blends hasn't proven consistent enough to be reliable. Using an upper cylinder lube or 2-stroke oil has been shown to reduce or eliminate it for that tank. I've personally run 2-oz of Lucas stuff in a full tank and its helped quiet the crickets noticeably, some have tried it and had no change, and others swear by 2 stroke oil. Do some searching to get more info and make up your mind.
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