A few tips that might help are:
1. Pull the balls further back, this really helped me a lot.
2. Push on the head of the penis slightly, the hole on the new Peecock's is actually too narrow to properly pee. The old ones had bigger holes. (I actually used to push two small bits of a drinking straw in the head, so the hole would be bigger.
3. Most guys try to pee over the band of their underwear. Instead, pull the shaft through one of the legs of your undies. This way, you won't have to fight with the elastic band while at the same time trying to point the shaft down and fighting gravity and such.