On your 1.9TD operating at redline and 19 PSI of boost (PR=2.3) the turbo's operating point would be a dot right almost at the surge limit. IOW, it's not a good match.
Edit: to illustrate what I mean, try
this and plot the mass flow
(4)[/i] to the PR (2.3) on the map you have shown above.
OK, so it's not right ON the surge line, but it's darn close. Plus, I have assumed that you will be installing an intercooler with 75% efficiency. If not, the airflow is going to be even less.