You need a tank on your arena team - and once you seven star Thrawn you can run Titans (either GK if you have him or OB if you don't, both work). Should be able to climb the ranks a bit there, assuming you're an October'ish start.
I know the Vets are a requirement and Rey is an awesome character, but you really need to work on your speed secondaries if you want to improve your arena standing. You have a handful of good mods (including that +20 cross, woot woot!) But, in general, you should be at a minimum of +80 for every arena character.
Better rank means more crystals means more refreshes means faster vets. Just a thought.