Did you stop using buffout or are you radiated?
initially my healing rate was 13 (fast metabolism) then I did cnets and floats, got radiated. Went to ncr doc and cured myself. Now my healing rate is 10.Obviously a bug of doctor curing radiation where the code doesn't calculate proper healing rate and overwrites the memory with a faulty calculation that doesn't take into account the "faster metabolism" trait..... (your welcome, mayck.....)