Use Heroic Leap against multiple opponents instead of Charge.
Stay in Battle Stance unless you will take heavy damage, when you should use Berserker Stance.
If you’re facing multiple enemies, use Cleave instead of Heroic Strike.
If you’re facing three or more opponents, use Whirlwind instead of or as well as Cleave.
You will take noticeably more damage than Prot, but as long as you're keeping your First Aid up to date, your downtime should only be the 6-8 seconds it takes to bandage.