If you have your albumin values, you can calculate your bioavailable T. That gives a clearer picture of how much testosterone is actually available for your body to use.
It’s also worth noting that calculated free T is usually more reliable than directly measuring it. I’m not sure if your low free T was calculated or directly measured. Check your lab panel to see which method was used.
DHT normally competes with testosterone for SHBG binding. Lower DHT may indirectly raise SHBG and reduce free T. Do you have any testosterone panel results from before starting dutasteride? That could help show whether the changes in free T are related to the medication.
DHEA boosts testosterone considerably IN WOMEN. But for men it’s supposed to be a drop in the bucket. I don’t pay as much attention to how to do it for men but I still recall hearing of far more effective supplements such as Tongkat Ali.