I played around with this a bit. Try putting the tremolo before the stack. That will make it mono and stop the panning.
Set the tremolo with the depth at 10.0 and the crossover at 20.6. Set ducking at <0.0>.
Then set the rate. For me, the tremolo didn't "stutter" unless the rate was set faster than 1/16trip with the tempo tapped in as quarter notes. It seemed the faster it was set, the more it stuttered. It's just perception because the trough of the tremolo does not go down all the way to silent/off and at slower note values it is discernible.
It seemed to "stutter better" with no other effects prior to the tremolo. Try putting the Tremolo in Slot A.
If you need it to be stereo, add stereo delay(s) after the stack. They will stutter also.
As I tweaked on this, I got more of a "sputter" effect by using two tremolos with one set at 1/16 and the other set at 1/32 (and many other note values).
And, I could not help myself: try putting three (okay, I'll admit it: I tried four ) tremolos prior to the stack. This did get closer to a stutter at slower note values. Set the tremolos to the same note values. Two tremolos set at the same note value seemed to improve the stutter.
(Okay, Okay, just don't tell anyone else, but I also put a fifth tremolo after the stack and various combinations are worth checking out)
But seriously, I'm not sure if that will work for you, or even sure if that is the effect you are trying to achieve. My thoughts are that, at faster note values, the tremolo does sound like a stutter. The trough of the tremolo does not go low enough to cut the sound off so, at slower note values you can hear that there is no break in the sound.
Please update us here as you tweak on it and let us know what you discover.