You don't want a 200tdi "expert" you want a Bosch diesel service agent - send them the pump and have them set the pump to as spec - then fit your boost pin. Alternatively, send the pump in and ask them to set it up a little above spec with your new pin fitted. This bloody tinkering with injection pumps by people who don't know what they are doing is a nightmare as you then don't know where the pump then sits in relation to original spec, then it does silly things and people get upset! The first thing I do with a potentially tinkered with pump is have it set to factory spec after I renew all the seals and give it a clean out and rebuild, they don't take much for this service as I have already done the rebuild and they are just calibrating it on the Bosch setup/test rig.
Anyone who claims to be an injection pump 'expert', in the context of tuning is talking rubbish unless they are removing it from the vehicle and putting it into the test rig, they may know what to tweak to get more out of it but without metering the diesel delivered and the dwell etc. on a test rig they cannot know what it is delivering and cannot know for sure that it may not be detrimental to the running of the engine long term.