In what unit is "1000"? If the DPF were plugged or back pressure were " too high", you'd be experiencing defueling and a great reduction in power. That and there's too many variables to properly understand that number in isolation. Was "1000" under load? How much load? Throttle position relative to that load? Those factors allow you to then extrapolate the HP that uptake should support. I'd expect 15 or so psi of backpressure under some conditions.
What "exhaust" temperature are you reading? How long were you holding the WOT? 600F pre-turbo is absolutely nothing to worry about. Under load, that value almost doubles. 600F post-turbo under moderate load is absolutely expected. Pre-turbo is over 1000F in that case. Pre-DPF temperature is around 400F at idle but easily tips over 600F under that load. It's probably over 800F inside the DPF in that case.
Here's some of my data.
Moderate acceleration, about 10 minutes of operation:
Start of WOT pull to 90mph after about 40 minutes of driving. Throttle rolled in to WOT:
Time 2, ~5 seconds from start:
Time 3, ~3 seconds from last:
Conclusion of pull, ~4 seconds from last:
At home, about 10 minute cool down:
Just drive it.