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before a custom tune, you need a log.
I had a similar behavior on my FBO 335, and it was on stock turbos; 2000-4000; not yhat jerky, but feel like a stock N52, then over 4000rpm all the power at once, like it was insane, and fun. Feels like a huge turbo lag.
But was fine for a year or so according to previous owner. Got the car cheap for that reason.
Unfortunately OP, I did a log, never posted it, had free time, and decided to go single turbo, before looking for the issue.
While doing conversion I noted : old vacuum hose on the rear turbo, bad setting in the JB4+MHD and bad fuel sensor.
Of course I change all this, so can't really tell which was wrong, since none of them givin me a code.
Note that wasn't the turbos, sold them, and they work fine on the new car.
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