Other tests that are important for "diffude thinners" are TSH, T3, T4, glucose tolerance, and fasting insulin. Thyroid problems are notorious for causing hair loss, and insulin resistance, more often than not, causes lowered shbg and increased free test.
These conditions also tend to manifest as male-patter diffuse hair loss, so don't just assume that since you're not losing as much off the back and sides, you're in the clear.
The solution may be as simple as Metformin or Liothyronine. Its not necessarily a coincidence that so many overweight men are bald.
Get a FULL panel hormone test. Your health is much more important than your hair, but you may be able to salvage both!
Also, my free test changed negligably even after 2mg Avodart 3 months in to treatment while DHT dropped to the level of a woman (one without PCOS)--only my results, of course. The Phd is correct though, diet adjustment can have an effect on your hair.