first thing should be a nicer trigger, get a magno blade from eclipse or an i-frame from HSW.
the second thing should be a delrin bolt, i reccomend a DART bolt from eclipse, hugely reduces ball breaks. get a stainless steel hammer to keep the firing mass right though.
the third is probably an LPC. the Vodoo ones are nice, or get a new valve. again i reccomend the eclipse one!!