Just my two cents worth of input.(posted 9001 days ago)What combination that might work for one might not work for another. Reason being if a personal test is conducted on a particular film make, this calibration would have been done on a personal enlarger different from others. The development time obtained might not be suitable . Some may operate cold lights enlarger which require different film density than a condenser model. I learnt this the hard way by trail and error. To get a proper neg to work for you, one first have to find their own personal film speed through his own personal equipment. This being his own spot meter, camera, lens, enlarger, enlarging lens, chemicals for film and paper and the knowledge of performing the test.
Hope this enlighten alittle.
Francis