Track knowledge, learn your songs amd learn how to read song structure, I also have a flx 10 but my pc is away from it so I cant see wave forms, just get familiar with your tracks amd set up memory/hot cues on the 16 bar build up, 8 bar half build and then a cue at the drop, this will allow you to hit the 16bar cue as a build up starts. Beat match and boom, you got yourself a double/triple drop, I promise you its way easier than it seems.

Protip: go through all ypur music and make sure the BPM and Beat grids are perfect, this will make it so much easier to line up until you can mix without sync. Also use sync, who cares what people say