you're usually only getting one street of value vs this nit from an underpair anyway, so leading is not terrible. Checking flop is fine also, but you might as well bomb turn even more. If you are only getting one street, you might as well jack up the pot as much as possible, and you want to get value from the earlier streets before he hits some lucky cooler...just shove river, you will make more from his AQ/AJ type stuff than you will getting his KK/QQ type stuff to cool.