I do not under-rate FP4+...I shoot it at its rated ASA (ISO)!
For negatives for platinum printing, I find FP4+ wonderful...and if there is a wide range of light values in the scene (7 or more stops) it does an excellent job for negatives for carbon printing (tho I can still pull it off if there is not such a nice SBR). HP5+ is a whole different beast that will not expand enough for me without major work (as in finding other developers). For carbon I like a DR of at least 2.5 but hopefully higher.
How I miss Kodak Copy Film! But in truth, I will use anything I can get my hands on: Bergger 200, Tri-X, Tmax400...anything but TMax100 (dang anti-UV layer!)