Not sure about the harder starts, but you may want to connect a boost guage to see what is hapening with your turbo boost. No power without it! May also need to check/clean the little port (forgot the name) on the drivers side of the intake manifold . It has a vacuum hose on it going to drivers side fender wall. you can unscrew it and clean it out. It often plugs up with gunk in the intake. That is the vacuum line that you can "T" into with a boost guage also

Get about 6 feet of vac line and pull it through the drivers window temporarily

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1987 300TD 147,000 miles- Palomino leather interior, 1995 facelift and body cladding, E350 wheels, Rebuilt suspension and sport springs, rebuilt turbo, New Monarch injection pump and injectors....and the list goes on and on...