I'm looking in my Service Record, and it says my Power suit level is 5. I'm at around 21000 XP for Power - it's taking me a long time to level up. How much more XP until it hits level 6 so that I can use all of the useful perks/modules?

It takes a while to level, but your best bet is to jump over everything you can, climb every wall you can, kick every car you run across, power slide as often as won't get you killed, and melee people when possible. Those'll get you points. Also, your K/D ratio and whether you win/lose effects your armor module score, so if you do a lot of power stuff but lose, you'll actually get a lower score than if you do just a bit, but win with a decent K/D. I realize this doesn't answer your actual question, but I hope it helps

Yeah thanks. Also, I should uninstall this game because the answer was in my face this whole time and I couldn't see it. It shows you how much XP you need for the next suit mode level in big letters right in the service record. Thanks anyway!