From what you are telling us it's hard to say. It could be new pins. It often takes a while for new pins to break in. If the lanes are new it could be that they haven't developed a track yet and won't for a while. Different types of lane surfaces take to oil and types of oil differently so this could be a factor there are too many possibilities from the information you provided. Is there something specific that you see that is different in your ball motion?
It's not uncommon for the end sets to play differently although the last three sets is kind of extreme. It very well could be from the cold air coming in from the door. You may need to experiment with different equipment and not just different lines on those sets.
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