Hi Greg, and welcome.
Please be aware that an elevated PSA and a correspondingly low Free PSA percentage can be caused by a prostate infection (prostatitis), which is a benign rather than a malignant condition. In other words, Free PSA alone had no diagnostic power in distinguishing prostate cancer (PC) from prostatitis.
The American Urological Association's PSA "Best Practices" document (2009 Update) advises doctors that consideration should be given to confirming an abnormal PSA before proceeding to biopsy. The majority of biopsy proceedures do NOT find PC, and the AUA feels that doctors should do more "due diligence" to eliminate prostatitis, infection or non-cancerous BPH before moving to a biopsy. Anyhow, sounds like your urologist jumped right to a biopsy (which is not uncommon)...or did he do a urine/culture test to determine infection (something you didn't mention)?
The more common (and AUA recommended) approach would have been to test for infection first...I would say especially with the fairly rapid rise you experienced in PSA, which is very unlike the typical PC but is like infection symptoms. If prostatitis symptoms are noted, four to six weeks of Cipro or similar antibiotic should be prescribed prior to recommending a biopsy. At the end of the Cipro therapy, a repeat PSA determination should be made. If there is significant lowering of the PSA, an element of prostatitis is likely to be present. Because it is also possible to have both prostatitis and PC, the PSA value after antibiotic therapy will more aptly reflect the status of the patient in the situation where a diagnosis of PCis subsequently established.
Wanna do a little light reading on PSA? Go to this AUA site: http://www.auanet.org/content/media/psa09.pdf?CFid=2648028&CFTOKEN=35046693&jsessionid=84307f42d7f956aedb10451065747970f241
Hoping for good results for you. If no PC is found, ask your doctor about eliminating non-cancerous causes of PSA elevation...like prostatitis.
best wishes...