You are saying its OK to pulse it at 100mA, my manufacturer says 30mA - hmm .
Some TV remote controls use the internal resistance of the battery to limit the current through the IREDs, perhaps your running 192 LEDs from a couple of AA batteries is doing the same, how many LEDs are on at the same time ?
Whichever, its bad practice.
I run my 25mA rated LEDs at 18mA, and out of the last 25,000 LEDs since October, I have had only a couple of failures, so I stick to that current.
I am pulsing the latest project ( 50% ) at 21 mA, still well inside of the recommended current.