I just began the job hunt as well! So I don't know how helpful my comments may be. But I did land an interview. One step closer to a job!
In my cover letter I had put a little blurb about my professional goal. I know you have how you are planning to get a bachelors but what about when you are done with that? Also maybe add a little more about yourself in a way. If that makes any sense. I explained how I am compassionate in my work and just made some character shine through. Personally, I think your cover letter is good just needs to add some flowers to make it better and stand out among others. I feel a lot of people put words into a cover letter but don't let their human character shine enough. Also, you may have it on the normal copy but it should look like a letter with your contact information at the top and the hosp. information below, and the date. Not sure if it matters but it shows you pay attention to details.
As for the resume, do you have a little objective blurb at the top? Like: Seeking a position as a new graduate in the Unit where I can blah, blah blah. Also, maybe add the tasks you did during clinicals, similar to how you have it under the CNA. What makes you so special? Such as: Initiating, interpreting, and assessing EKGs and electronic fetal monitors; blood glucose testing; catheterization; dressing changes; vital signs. I don't think you need to add hours after the clinical rotations? I could be wrong. And I think the "references on request" is a given and just a waste of space. That space could be used for something else!
Let me know if any of this doesn't make any sense! And good luck!!!