I won't get my hopes up too high. Air Control doesn't exactly have a history of making videos with a lot of t-back.
And there's DGYU-009 which eic-book categorized as having t-back, but it actually doesn't.
Mayumi, Koharu and Tomoe all seem to be going around in circles. Just because Tsukasa is on the same label and doing t-back and other further stuff doesn't mean any of them will be . Mayumi's latest vid appears to be a case in point.
For some reason, they're (mostly) doing just the same things as when they were JI, and not as daring as some JI in fact.
It's their business and obviously they have a buying public, but as you say, I'll believe it when it happens.