The reason why we don't find the same intensity deviations for the glitches seems to come from the detuning percentage of the fwhm.
The second crystal has to be detuned enough to eliminate harmonics (totally or mostly) but not too much either, we still need to detect the fundamental.
This is possible to do (and is done), but the tricky part is that when we eliminate the harmonics, we also decrease drastically the ncount (number of rays) of the fundamental.
This means that when there is a glitch, the ncount of rays of the fundamental is not high enough to cover up that glitch if it is not that big/important (such as
only having one or two other planes for example).
This means that when there is a glitch, the ncount of rays of the fundamental is not high enough to cover up that glitch if it is not that big/important (such as only having one or two other planes for example).
Therefore, this gives us glitches with higher intensity deviations than they should have.
Just the right amount of detuning to both eliminate harmonics, see the fundamental and most importantly have enough of an ncount of it seems to be complicated to get.