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All of us have this problem when learning to hammer on and get a clean tone. The finger you are using to hammer on with needs to strike the new fret position at a 90 degree angle, the finger tip right below the finger nail should be firmly pressing the string down to the fret board and it is landing very close to the new fret. Not the middle of the fret. Practice on the open G, B or treble E. Pick the open string note and with your index finger press quickly and firmly down on the 2nd fret board. When that becomes comfortable Move the index finger to the 2nd fret of the G string and Pick and hammer on using the middle finer on the 4th fret of the G string. Practice that position until you are comfortable and achieving a clean tone. a lot of folk and country pickers hammer on the open D string to the 2nd fret E note when playing an C chord. If you learn to hammer on to that note while fingering a C chord you are well on the way to learning hammer on’s.