Reraise preflop on hands 1 and 2. Bullets are most profitable when played HU.
Hand# 1 - looks like a set beat you.
Hand# 2 - is either a set or a flush.
Hand# 3 - Be careful in those multiway pots, looks like flush or boat.
Hand# 4 - Reraise preflop 3-4x his initial raise
Hand# 5 - Tough call on the river. I'm probably folding here, looks like a slowplayed set or 2 pair.