1:1 ratio of Test to Nandrolone dosage is one of your problems. Also watch your Prolactin levels. Both of these factors can contribute to sexual dysfunction.
go one step further, if you please, and tell me what a preferred ratio is.
in other news ... i bought a ****ring to see if that'd help. and it did, with masturbation. see girl this weekend, will try. i know it's to keep a hard on and i suppose retard ejaculation but i've read it can work otherwise, too. sure do like the way it makes my penis look bigger, like a purple veined monster ... well, mini-monster, given the reality.