Is your Galactic War too hard? Here is some help.

I have tried about 20 times. The team I'm facing is standard Phoenix, Hera lead. Most I've done so far is removed half of shields from a single char before starting to lose my team one by one. They're way too fast, heal and regen protection way too much, and do way too much damage. Like I said, even if I had 10 teams, all at current level and current gear, it'd be no use. I can't even attempt to wear them down.