At this point my most successful strategy seems to be this:
-slice slice slice
-bring opponent forward with low slices (not quite drop shots)
-come to net and challenge opponent to pass or lob (hoping for the pass attempt)
-throw up moonballs to reset point when inevitably pushed off court by aggressive groundstrokes
-chip/block returns, either high and deep or short and low
-if possible, receive second serves from well inside the baseline to pressure opponent and encourage DF
Basically, be annoying.
This seems to work pretty well at my level (3.5ish), particularly against impatient or slower opponents. Against stronger players who are hitting their targets, I start to feel like a punching bag.