LOVE it. Nice and clean and simple. I'd change 2015 to vol. III or something similar since there will likely be more than 1 meet this year. I told Theo I'd put something together if needed, but never heard anything. I'd buy this shirt in a heartbeat.
The 560s are significantly trickier to drive. And you wouldn't want to go with the Vali or Valhalla in that case. Something beefier like the Lyr 2 would be in order. The T1 would probably pair quite nicely with the Valhalla 2. Don't be afraid to look lower for your headphones. I'd recommend a used HE-500, personally, but there are a lot of good options out there and it all depends on your preferred sound signature.