Don't know much about the MK5 Dervs but from a MK4 perspective your HP looks very low compared to the initial torque you've got and the Torque & BHP tail off quite drastically after 3250rpm which seems stange and low?
The initial spike of torque at low revs up to 345lbft before it falls back down to around the 310lbft mark is completely normal as all the TDI's have this trait as the turbo kicks in.
Can I ask what map it is your running as I'd suggest they try and move the power band up the rev range a fair bit to give you more lasting power, I'd of expected your max BHP to come in closer to 4200rpm and your torque to last to around 3800rpm before tailing away.