There are a lot of threads about this so try searc..but
No 3000 at 100 is too high..more like 2300 depending on tire size
Is the auto box moving into lock up around 80? If not, then 3000 at 100 makes a lot of sense and it is a transmission fault.
The generally accepted way to go about this with a 300tdi is
Get egt gauge
Adjust FIP
Mostly this is sufficient but if not then.
Bigger intercooler
Re adjust FIP ( bigger intercooler on it’s own without fip fiddling does little)
If you need more then
There are also tricks with adjusting boost
Then if you still need more then you are into the realm of better turbos including the hybrid style you mentioned.
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