I have been playing some "standard" Dengar lately (Expertise, K4). If he manages to survive and stay stress free he certainly kicks ***, but lately I have been having trouble keeping him alive, especially against higher PS ordnance carriers.
Back in the day I used to play LW/ReconSpec Dengar and got some decent results. That setup got trumped by Dengaroo, Torp-Dengar etc, but nowadays those options for Dengar dont exist anymore.
Here is a list I put together where Dengar is coupled with Nym, who might be flexible enough to be able to fly independantly (since you want that LW to be active).
Dengar/title/LW/ReconSpec/Glitterstim/Countermeasures 55 points
Nym/VI/AutoblasterTurret/AccuracyCorrector/ExtraMun/Harpoons/BombletGen/GuidanceChips 45 points