If it is really crunch time and I am super worried that I have to get it in ... I will kick it towards their left hip. Enough margin to make sure I get it in ... a difficult enough serve that they will have a tough time attacking it.
However, if I am in a groove serving, feel really comfortable and it is not late (ie set / match point) then sometimes I will hit a hard serve with an eastern forehand grip. I find I have lots of control over this ... it goes at about 90% of the pace on my hard serve and it has just enough diagonal spin to cause the returner fits.
"You should be playing linebacker, not singles."