Welcome to the Board!
You could have prostatitis that is waxing and waning, with the recent PSAs happening to catch it at various points on its swings. Prostatitis also affects the free PSA results (but not PCA3 results). There could also be some benign growth mixed in (BPH), but of course there could also be some cancer.
There is a new test that has just been approved by the FDA. It is known as the "Prostate Health Index" (the "phi" test) from Beckman Coulter. The company touts it as "2.5 times more specific than PSA for patients with PSA values in the 4-10 ng/mL range." It will be commercially available later this summer.
There is a recent book that is outstanding for people like you who have not yet been diagnosed (and for those who have been): "Invasion of the Prostate Snatchers," by Ralph Blum and Mark Scholz, MD.
By the way, your questions certainly fit under this thread, but you are also free to start your own thread where you would be able to track your posts and responses more directly.