so an update - dropped this off am, it was drained, tested, and refilled - all set - cost me $150.
my local indy only works on bmw and porsche and seemed to have no concerns, he said typical full is 1.6, i was at .3 - and he looked for leaks with multiple tests, and nothing popped up.
so for me at least, it was a recharge. I will say - the air was never warm even on hot days, just mildly cool. and the rear pass vent was much cooler - so there was hope at least that there was something smaller than an evap or condensor.
ill monitor and update if anything else changes - thanks for the feedback. and no, there is no more hissing sound!
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