I know the basic technique for tapping and can do it on the high e string fairly easily, but when trying to do it on other strings i get way too much noise and the sound is never clear. Is there a certain angle or something im meant to be hitting the strings at? thanks
^, also make sure to tap at the end of the fret as this is the optimal position for volume.

You basically treat your right hand as a mirror of your left hand in full two handed tapping, but if you are only using one finger on your right hand then it doesn't matter as much.
Take a close look at Greg Howe or John Petrucci's playing. Can't beat learning from the masters.