NO!
could have
would have
should have
It's past tense...it's stating what you could have done, would have done or should havedone. Could've, should've, would've are actual contractions of those terms...they're in the dictionary and everything!
It's not could'f, would'f or should'f is it?
'Of' makes no fucking sense! Stop using it!
I'm not generally one for the grammar pedantry but this one makes people look thick in a way that other common grammar mistakes don't imo.
Sorry...but I felt the need to express. Boot me about if you want.