I've been a few times now and have tried everything. Avon Skin So Soft when applied to me is like gravy to the midges. I bought some stuff from the Ben Nevis visitor centre but all it did was make me smell like a ponce. At one time I took an Insectocutor. After the first night I took the bottom off to see how many I'd killed and they all flew away. They are that small they don't even touch the electrified wire that's supposed to sizzle them.
And don't believe the urban myth that they don't come out in the rain. They do. Probably the only time they aren't about in great numbers is if it's windy. A curry could work wonders but I've not tested it.
I found the midges bad at every site I visited on the west side. Loch Lomond, Campbeltown, Oban, Fort William, Morvich, Killin etc were all bad but Clachan, Killin probably won by a bite. In the end they were biting my bites because I hardly had a patch of clear skin left to chew on. Like DD, I have still got the purple blotch war wounds on my arms from years ago.
I remember driving into Kenmore and seeing a man mowing his lawn wearing a bee keepers hat. Further down the road were people waving their arms about like demented octopus's out of water. I thought the loons had broke loose out of the local asylum. I soon found out when I got out of the car.
I've just got home from Beddgelert. As usual I'm covered in midge bites and although the Cambria Midgium is just as hungry as Caledonius Midgium they aren't half as itchy as the Gaelic buggers. Still bad enough for me to cancel another similar site we were supposed to be going to in three weeks time. I couldn't put myself through that again before these have had a chance to clear up
Stick to the east side if you hate midges and they make your life hell. Two lovely sites are the CC at Brora and the C&CC site at Rosemarkie, both within minutes of a beach.