Bob:
I've got Fuchs wheels (16X7 all around), and I got my "Porsche" alloy lug nuts from Tweeks (now Mid-America?). They have the 60 degree chamfered mushroom at the bottom to match your Fuchs wheels. I haven't been torquing them quite that high, but get them to 75-80 ft. lbs. cold, and have had no problems with them (Hey! It's a light car, right?).
In fact, before I found that my cheap wheel adapters sucked, I had the wheels off and on a LOT, over the years, trying to find out what was going on, and never cracked a lug nut yet. I use anti-seize, as Angela and Steve do and have never had a problem getting them off or stripping them out. In fact, been running the same nuts from day one, almost ten years now. I always put a film of anti-seize on the mushroom at the bottom of the nut, too. When you order them, get the special plastic-lined socket so you don't mar them. I didn't, at first, so I tended to super-clean and paint them every other year or so (Krylon semi-gloss black works for me).
Just got my new wheel adapters yesterday from Pelican Parts (nice folks, and the adapters are 4-bolt VW to 5-bolt Porsche) and should test drive them tomorrow. Whoo-Hoo!!