100 hands is ok for basic preflop stats (in essense its a 100 hand sample of the stats), its just not enough for much else. Even a 35/31 has essentially only seen postflop 35 times. Of those 31 were as PFR, so he's only seen postflop 4 times as a flat caller. See how quickly your sample size shrinks?

MR is confusing, and its where I prefer to have notes than stats (stats dont tell you his cbet raise std v's min for example). Some people do it as a cheap bluff, some people do it as value. Folding isnt bad. I normally wouldnt when he can have such a tiny range that beats us, but lets face it, Nuts is significantly better than I am .