It turns out that my original levels of proved accurate, with 7300 forming support on the mid-May retest. 8300-8400 was a level of resistance till the structure broke out to the upside (see illustration below).
We saw a retest of 8400 at 5/28 and 5/29, and it appears to be holding today. Things are looking good for the bulls. 9k seems very attainable at this juncture, which, if breeched, should fuel a move up to 10k, the next level of resistance.