I have the swaypro and I had to flip it over to get the proper ball height. However, the front end should not be lifting up. On the website, I remember there is a chart that tells you to add or subtract chain length depending on what is happening. Here is the link to it:
http://blueox.com/wp-content/uploads/2014/03/BXW035005500750100015002000.pdf
Reading it, it says you need to tighten the chain more. That would make it look more flexed like an other poster mentioned. Mine has a nice curve to it and I am perfectly level.
