I think you would be better off printing some calibration objects instead of actual parts. That way you can follow a guide on what you need to do to improve the parts and calibration of your printer/software. Otherwise you will be chasing your tail.
I use this set of calibration objects and followed the guide in the instructions on thingiverse
http://www.thingiverse.com/thing:5573
There are a lot of other tips out there for getting your machine to print well but until you have your base layer nailed down and your extrusion rate figured out you are just guessing.
When I calibrated my Esteps I tried to follow a the guide listed here on the forum but it wasn't even close when I calculated it based off of that guide. I ended up finding that 1 estep change =.22233 mm in extrusion length change. My esteps ended up at 878 "was 841 originally"