I understand. I found herbs that may decrease shbg:
avena sativa, urtica diotica (stinging nettle), and muira puima.
I know you have normal value for T and E2. You may benefit from some active vit D supp, yours is close to the lower limit of normal. You may also benefit from a period of low-fat diet as in Doug Graham's 80 10 10. Erection is influenced also by the blood vessels' state.
In my case PRL is rather a problem for my joints and bones, even if I am young. Libido wise, I have no troubles. SBHG was always normal, as all other hormones.