Well i tried the blowtorch method and I'm a little disappointed. Although the naans puff up as expected they don't cook inside and end up uncooked and doughy. I think turning it over on the tawa and letting it burn a bit produces better results, but worth a try anyway.
Maybe the heat of your pan wasn't high enough or a problem with the dough, thickness etc...mine are never uncooked, perhaps just slightly doughy, but no more than a naan should be.
Sorry it didn't work out for you but personally I still haven't found anything better for the mo'.
Thanks for your feed back though.