Thanks for the feedback!
I have very little research experience, but I don't think that will be necessary since I'm applying to the non-thesis/research degrees and don't plan to go on to do a phd. For example, I know that the MEng at Cornell does not require any research experience. Also at CMU, I'm applying to the Entertainment Technology program which favors those with portfolios (which I have) and doesn't require research experience. My intention on going to grad school is not to do research, but to develop my professional skills, which is why I'm applying for a masters and not a phd.
Also, it was my understanding that the phd applicant's average GREs were as high as you say, but that the masters were lower. For example UPenn (I'll be applying to the CGGT here) has published their stats here http://www.cis.upenn...ion-stats.shtml. I doubt that GRE scores matter much anyway.