I reforged at max familiarity and got 15.7%. I assume that won't go up from there.Wait. Is your weapon at max familiarity? The max value for Close Combat IS 15% if your weapon is at 0 familiarity. At max it'll become 20% which is the real max. I hope you didn't already re-roll that 15%.
Soul Matching doesn't care if you can wear the gear or not. Just max its familiarity and transfer the Attack atttribute.
Sweet to know about the Soul Matching! I'll max that out!