I guess if you're using brass connectors and having trouble with heat you could wrap some pieces of tape or a strip of rubber around the fitting (secure with with tie wire). You don't need much to take the sting out of them, I can grab mine at any stage through the brewing short of when I'm recircing boiling wort, but there is no need to touch them at that stage anyway. A leather glove also works well.
But might be an idea if it's a problem for you. FWIW i don't know what you're describing regarding the great grips. Always open to knew ideas and findings.
Cheers, Justin
Edit: Actually they look pretty neat. Nice find. Guess you can still work the fitting ok with them on then? How much for a set. I've been pretty happy with my brass connectors, have you been happy with yours?