From 1700rpm - 2500rpm I get a (very) slight juddering as boost is coming on. This doesn't happen with a WOT. It is more noticeable in the cold and in lower gears. Could this be a very minor hose leak, an issue with the DV or typical behaviour as pressures are just fluctuating slightly as the DV is operating? The car has always behaved this way but I am noticing it a lot more now as it is colder and I have been paranoid ever since I started modding the car!

Am I just worrying over nothing as turbo cars in general just don't feel as smooth in these conditions?