Re: color profile. Calibration part is fine. Choosing a "working space" is another matter. You have chosen to convert all your images to a profile that looks good only for that one particular printer. If you ever want to use a different printer, or post them on the web you will need to convert them to a different profile. Saving your images with a profile other than aRGB (adobe) or sRGB is not such a good idea. Have you tried the sRGB with your HP?
I recommend sRGB because it is pretty universal.
Here's some good reading: (select INTRODUCTION, COLOR SPACE)http://epaperpress.com/psphoto/index.html