By 5 months after facelift your healing is significantly down the road to completion, but complete scar maturation can take 6-12 months, and maximum sensory nerve regeneration can take up to a year or more, and may not completely return to "pre-op normal." Your own comment that 80% of the numbness is gone is right on target, and can be expected to continue to improve a bit more over the next few months.
As far as tightness and pulling are concerned, this too should improve, but you do have scar tissue, healing sensory nerves, and none of this "goes away" but becomes less noticeable and bothersome as you develop into a "new normal."
Sometimes tightness and pulling are technique-related, and skin-skin facelifts (or what I call "hanging the cheek skin from the earlobes") without deep suture fixation to the temporal and mastoid fascia can give not only a tight, pulled look ("pixie earlobes") but also the sensations you describe. Securing the deeper tissues with soft permanent sutures (SMAS plication or fixation, and platysma plication or suspension) to the temporal and mastoid fascia can help increase longevity of the result, decrease tension on the skin incision (better, less-visible scar), reduce the tight, pulled sensation as you heal, and prevent the "pixie ear" deformity!
But only if it's done properly!
If you look great, have hidden incision placement, minimally-visible scars, and no distortion of your earlobes, then good for you (and your surgeon). The rest should continue to improve.
If any of the above are not being seen, then you may be a candidate for revision to improve these factors, but not for an additional several months until you have reached you new baseline and an appropriate plan developed.
Fortunately, the former scenario is the most likely, so be patient with yourself and be glad you look great. If not, this can be improved in most cases. Best wishes! Dr. Tholen