Good guide kobansora - hitting comes with time - i have a real nice hit now -
with practice it will
1) become more defined
2) have less effect on your movements and your limbs/fingers.
3) get harder!!!!
also: heres a couple of ideas to try
1)To accent your hits or add variation think a "tense-relax-then move" cycle rather than just a "BANG! - then move" .
This will allow you to delay your motion for the duration that you spend "relaxing" to get a bit of extra funk and animation style to it
2) try a very short "dime stop-relax-BANG" cycle too - for a more bopping-like effect - i call this bapping...

. not really but i love the word bap.
3) then theres "bang! - dime stop- BANG! - move" - GREAT for botting, throw it in once every 20 seconds or so for that mechanical flavour