If there are any sensors failures it will throw up an EML light on. SO unless you have that i doubt it is a sensor
problem, a lot of the time what seems to happen, is when the larger boost quantity is asked for when you put your foot down with the dpf it clogs up very quickly and can't cope with the outgoing exhaust gases so cuts back automatically on the boost.
On the dpf delete matter, i maybe completly mistaken but i have a sneaking suspicion, the hesitation is possibly due to the injectors being maxed out. The amount of fuel needed for the requested boost is to much at times as these injectors are only quoted to give 230-240 bhp i'm led to believe? It may be the car pulling back on boost to try and save the injectors from self destructing?