why not use a glove?
In 43 years of ' scratting about in the muck' as my mam used to call it, I have always been stung, regardless of grip, direction or moon-phase! when I gather nettles, if I have forgotten my gloves, I use the method taught me by a one legged bloke with a glass eye and severe dandruff; grab them as near the base as possible, yark them out and then use a good fistful of dock leaves gripped around the stem of the nettle and pull the stalk through, stripping the leaves as you go.
seriously, this works a treat but you always get a few little 'buds' left behind, regardless of method and these tend to catch you. I also get stung on the wrists by the way, even when wearing long sleeves! it just goes to show you never can tell.
happy yarking!