[Gap23Razor]

hand 2 - calling down is fine, although you might consider betting on the turn or river (semi-bluff or even stone bluff)...when its checked twice to me i usually bet unless a scare card (A or K, flush card or straight card came)

you might want to read Matt Hilger's "Book of Bluffs" to learn what are good bluffing chances if you don't already know that, or perhaps read some of his articles on line...do a google search