Am I a candidate for a second revision rhinoplasty? It would be my third rhinoplasty (Photo)

You are still healing so it is premature to assess the results. Each time you do a revision, it gets increasingly complex so you would need to ensure that you consult in person with an experienced and expert board certified plastic surgeon to do the revision.

I think anyone who desires a change to their nose is a 'candidate' for revision rhinoplasty. That being said, you will need an in person examination to see if the degree of changes are realistic with where you are starting from. I would recommend sitting down with a revision rhinoplasty surgeon and discuss your options. Best of luck

Seeing that you are only 4 months postop, there is a considerable amount of healing that still is occurring within the nose. The nasal tip is the one region of the nose that is known to have prolonged swelling and is one of the last areas for this to resolve. As the nose is healing, some asymmetries may be noted as swelling decreases in one area and not the other. I always tell patients that they should wait till one year postop before they consider a revision because this will give a more accurate assessment of the final result. Given that you have gortex and rib in the nose, you likey had a considerable amount of work performed and this can also contribute to prolonged swelling. Be patient and make sure that you regularly follow up with your plastic surgeon. 

It is possible to have another revision
rhinoplasty to refine your tip, provided that your expectations are
realistic and you have waited at least one year since the surgery to see
the complete healing.
However, revision rhinoplasty is one of the most challenging of all
cosmetic
surgeries, and each time a rhinoplasty is done, it becomes increasingly
complex. Keep in mind that there are many factors involved, so your nose
may
not turn out exactly the
way you want the third time either. I recommend getting a second or
third opinion from a well-experienced revision rhinoplasty specialist.