when i first started i was the same, i had a hammer onyx vibe i could barely get it to move at all. so i bought an aggressive ball i got the motiv 2 cruel which is stupidly strong.
now after a year i can get my hammer to move just as much if not more sometimes because it reacts earlier.... i can go gutter to gutter. save your self some money and just practice more. more revs better release etc