I have exactly the same
problem. You accelerate gently (for me normally in traffic), lift off, apply throttle again and get a small hesitation before power coming back in as normal. Really annoying.
I'm going to re-seat a number of connectors and probably add the dielectric grease to the mix to see if this clears it. Also, I haven't changed fuel or anything before I got it but I did switch to Shell V-Max for a couple of tanks this week and its still the same. Also I go some Millers Diesel Sport 4 to chuck in tomorrow with the top up of Shell V-Max! Should be interesting.