Can confirm the TL's are ridiculously tight on some rims.
Reports are that the S TR goes on a lot easier. This guy installs one on a Zipp 303S without levers. It goes on really easy, though he does have to use a boost tank to seat it:
WhyFi I can't tell from this video if the tire stays seated on deflation or not. It looks like he doesn't let all the air out at the end, so hard to tell.