I talked with my brother who is a master mechanic in Ireland and he was saying the serpentine belts need to be a lot tighter than we had thought. Internet myth states that you can turn the belt through 90 degrees with your hand and it's tight enough which he says is bull shit. They need to be tighter than that. So, it's time to buy a tool. I bought this one:
http://www.otctools.com/products/detail.php?id=1762
from http://www.etoolcart.com. Hopefully, this buying experience will be a good one. I ordered it today and I'm waiting for a shipment notice. Once the tool arrives then we can start checking tension etc and see where we get.