Do you have more information on the AD9764 glitch impulse? For example, is it roughly symetric above and below steady state level? Is it proportional to FS set current? Any screen captures?
BTW, nice DACs, used this line before, just never had to be so concerned about glitch energy.
I've attached a measured glitch impulse waveform done on the AD9764. Glitch impulse behavior is not characterized, has no limits and is unpredictable.