There is a chance that the remaining problems are "relicts" linked to already existing large delta storages. You can try iftables with a large delta storage improves the situation:
MERGE DELTA OF "<table_name>" WITH PARAMETERS ('FORCED_MERGE' = 'ON')
SAP development has heard about similar issues with Rev. 93 at other customers and is reviewing it these cases at the moment. So there is a chance that also Rev. 93 doesn't work 100 % as expected.