Issues with hunter macro

Im working on a macro that i can spam concussive shot to help bring out stealth, however if i already have a target i want it to keep current target and not tab target (which is currently the issue im facing atm)


#showtooltip Concussive Shot
/targetenemy
/cast [harm, nodead] Concussive Shot
/script UIErrorsFrame:Clear()


any help would be greatly appreciated thank you for your time and reading.
Try a mouseover

#showtooltip Concussive Shot
/stopcasting
/cast [target=mouseover, harm,exists][harm] Concussive Shot


Either the mouseover above or you're going to have to tab target.
#showtooltip Concussive Shot
/targetenemy
/cast [harm, nodead] Concussive Shot
/targetlasttarget
/script UIErrorsFrame:Clear()