I like to redirect slow first serves (<60 mph serves) by taking a short backswing and keeping the ball in front and pointing my racket where I want it to go. On faster serve I just poke it back as a deep slice. On any second serve less than 50 mph I'll take a full swing to put on the pressure. One thing I do try to do though is never be more than a feet off the baseline when I return the serve. I'm rarely outside the baseline when I return a second serve and am always either on the baseline or inside the baseline (depends on serve speed) when I return the first serve.
Wilson W6 Blue Steel 4 1/2, customize to 11 oz unstrung and 4 pts HL. Tecnifibre Pro Red Code 17g at 54 lbs .No dampener, Prince Resipro grip.