As for your original question, I'd never run my test lower than any nandrolone. I've done it and it doesn't go well....but that's me. Everyone has their own way of running things. I feel best, get better gains, have a sex drive through the roof, look fuller, etc....so it's a no brainer for me
If you do well with test and aromatizing compounds like me,run it twice as high as your NPP. Most average people should run them even for best results. And for the people that are highly estrogen sensitive, test should be kept lower. That is my educated expereimce and knowledge on the subject