Oh, crap, Starf1sh .
Sometimes it's nice to achieve the impossible, but not when it's decreasing lining. (My sister once managed to have decreasing follicle size while using FSH for an IUI. The Drs gave no reason to explain the impossible there either.)
I don't have many ideas. Maybe pop over to Sydney girls and chat with EO about pomegranate juice.
Prednisone inhibits cell division, are you able to wait until the lining gets close before commencing it? Maybe start off on aspirin for the early days to decrease any underlying inflammation then switch to the prednisone later? (and cross fingers that blood thinning of aspirin also helps nourish the lining?)