Something else to consider here, DHT actually has a higher effect on your libido than Testosterone. Recently studies have shown that men with higher levels of DHT actually have higher sex drives, than men with higher levels of testosterone. They've also postulated that higher levels of Test don't necessarily equal higher sex drives, and the increase in testosterone typically correlates into higher DHT levels as well, which is why most men get a higher sex drive with higher levels of testosterone.
So there's more studying to be done on exactly why libido increases when you take a natty test booster, and some men may not respond the way it has been published.
One thing is for sure, I've taken horny goat weed, and man does that stuff work. So if you're experiencing a lower libido on any supplement, try adding in some HGW and see what happens. It could be all the change that you need.