My new 2020 790 Duke, at less than 300 miles, has one very annoying problem. At low speeds the bike will not proceed smoothly. It jumps ahead then slows, all very suddenly and gets worse if you try to persevere. Its fine at idle or accelerating briskly. Hasn't been to the dealer yet, but in a phone conversation, they suggested its normal for a high performance engine. I don't believe it! Comments please.