HC
To go to CAT 2 requires a significant amount of additional training for a 50' reduction in DA and its just not worth it.
Interesting that you need extra training to reduce the DH from 200ft to 150ft. If my brain is working today the RAF Seaking had a DH of 150ft for an ILS and PAR - this was due to the calculation of DH for various a/c which included an Aircraft Approach limitation (AAL) which was used in conjunction with the Obstacle clearance limit (OCL). This produced a DH for the Seaking of 150ft - we had no extra training for this - you just flew to that limit.
Crab may be able to confirm if this is still the case - the ILS was also manually flown as we had no coupler for approaches to airfields.
HF