as you may have learned, diesel engines are VERY sensitive to valve adjustments. on big engines in trucks after they are adjusted they sometimes run crappy for the first 500 miles then start to run better then they did before the adjustment. probably car diesels are no different.
it may run better after a week or so... be patient.
my little Toyota pickup has less slow speed power after i adjusted the valves but runs better on the highway... just the way i adjust them i guess. everyone has a different "touch' to adjusting and the engine will run differently with different people adjusting valves.
hope this helps a little.
robert

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Current money-pits:
96 Passat TDI
78 300D 100k miles(60miles/day)FOR SALE
91 Jetta Diesel 250k miles (80miles/day)
82 Toyota Diesel pickup 150k miles; out of service for a little while with a valve problem.
All on BelenBioDiesel
Past diesels:
01 Golf TDI
81 Isuzu P/U
85 Jetta
89 KW 425 cat
85 Pete 400 cat (currently still running the west coast with over 1.5 million miles)
81 KW 400 Cummins
77 Freightliner CO ???? Cummins (Buttercup)
57 180D lots of miles(gone but not forgotten)