Excuse the thread resurrection, but I've just succeeded on this mission after ages of going back and forth and repeated failures! My winning tactic was to treat it like a recon mission, rather than a one-shark army fighting it's way through the valley. From the FARP I headed to just North of central Bay'b, then dashed South across the valley as quick and low as I could to hide in the hills on the Southern side. I took a couple of laser warnings on the way across, but nobody managed to get a shot off. Once safely across the valley I flew East above the hills but close to the ground to stay out of sight of everything in the valley. I came up to the recon target from the South, took two or three Iglas on the nose but kept on trucking, detected all the targets, blew them up, then retraced my path and headed for home. Unfortunately my wingnut died early on - he's not really suited to sneaking about!