FoxyTd5

Despite new VDO fuel pump, fuel filter, recent new VDO air mass unit, injector harness upgrade, ECU dry & clean etc My Disco 2 Td5 hesitates to respond and accelerate at bends and junctions after lightly breaking. Foot needs to go further down but not increasing revs too much before catch up. 175k on the clock. EGR not yet blanked. Relatively new hoses and all appear good. Any ideas? Could it be fuel regulator or injectors? Nowhere suitable inside to work on her so have to work outside. Thanks.