As someone with an M.Sc. I was advised against pursuing an M.A. in exp. psych by a DCT from a clinical program (although that could be because I already had a master's). A master's CAN help, but it's not a guarantee. A better option would be to work in a research setting and getting a paper/poster. Something that can happen in an M.A. as well. Regardless, most people that get in already have a master's so it wouldn't hurt you but if you can get a research position where you can work as an author that would be equally as good. Food for thought.