Hi Jason ... the first thing I would suggest is that iso400 is too slow for a 40 sec exposure. Try going to at least iso800 and see how things pan out.
Also try and get a better polar alignment, you have a fair bit of movement in your stars in this image ... maybe cut your exposures to 30 seconds. Stack your images in a program like DeepSkyStacker ... it's free and allows you to do basic processing before going to PS for a final adjustment.
http://deepskystacker.free.fr/english/index.html
