I have my middle school students sightread weekly. I know you are all above their level, but some things we talk about when reading are:

Check the key signature
Check for modulations
Check the road map (repeats, D.S, D.C., etc.)
Always know where 1 is
Time is more important than correct notes and rhythm
Rhythm is more important than correct notes
Always know where 1 is
The more complex and difficult the passage, the more you need to relax
Always know where 1 is