pygeum gives me horrible headaches, I'm all over this thread posting as someone that pygeum is ineffective for. Pygeum, for me, does that opposite of what its supposed to in that it totally dries me out. It just makes me need to pee every five minutes, gives me headaches and hypertension and a really bad temper, and quite lowers my sex drive.
Everyone's body is different, no one thing is going to work the same for everyone else. I've stated before that I'm a huge advocator of pine pollen. If things effect you similarly as they effect me, I would encourage you to look into pine pollen. I get no negative side effects from it. Though it may not make me "leak like a faucet", it definitive makes me produce more precum (and cum as well). It also makes my erections much denser and just generally makes me feel good.
Also doing 500+ kegels a day and edging a fair bit will also help with precum production.