doxazosin dosage - any reason to go above 2mg?

[sexualathlete]

I found doxazosin to have a pretty significant effect on my dick. Bigger flaccid, better erections etc. I have no prostate issues (I think). Do the pro-erectile effects keep increasing if you go above 2mg? How much do you take? I've read people take up to 16mg. I'm usually on quite a bit more gear than TRT if that makes a difference.