My husband, age 55, had a prostate biopsy almost 3 years…

My husband, age 55, had a prostate biopsy almost 3 years ago, as part of a work-up for gross hematuria and elevated PSA (3.8 at that time). The biopsy was negative, but he had an enlarged prostate (40) He also had a cystoscopy which showed significant bladder trabeculations. He started on Uroxatral in January, 2010 and on Avodart in November, 2010. His PSA reached a nadir of 1.7 in May, 2011 and has been gradually creeping up ever since: 1.9, then 2.0, now 2.2. His doctor is recommending another biopsy now, but my husband is leaning towards waiting another six months. We are going to request a Free PSA (it was 26% at the time of his last biopsy, but he hasn't had one since.) I would like to have the Free PSA done now, and, if it is still okay, wait six months on the biopsy. My husband wants to wait to do the free PSA. His doctor says the Free PSA is not even valid with PSA's under 4.0, but she will humor us and request one, I think. I have found several studies saying that it is valid in lower PSA's. Also, I read that while doubling PSA for men on Aodart is only a rough rule of thumb, Free PSA percentage is not affected by the drug. I do realize that an increase from nadir of 0.5 while on Avodart is a significant concern, though.
Our questions: your thoughts on the free psa? On waiting six months for the biopsy? What about the Pro PSA? How widely available is that? Should we request that be done as well?