Worked for me with 4 x32.
(IIRC I tried with slices x2 “-2” and “-1”)
4x and 33 (yes, 33) seems to work OK. That led me to try adding 1 to the SPD.
2x and 65 seems ok.
8x and 17 seems ok.
16x and 9 is not ok.
32x and 5 is not ok. 32x and 4 seems well behaved, though I’m slowly losing my mind at hearing the same bar for so long. 
The behavior is definitely dependent on BPM. With mult=16x and speed=8 I found a 130.4 works as expected, 130.5 doesn’t.
118.5 doesn’t work well, but 118.6 does.
137.5 seems to behave well, while 137.0 doesn’t.
Hmm … another puzzle to think through.
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Yes I already wrote above speed up worked. But I don’t like to.
137 bpm worked with 4 x32, your settings are probably different.
And yes, not a surprise behavior is tempo related…
Annoyingly it isn’t tempo related in the same was as the recording buffer stuff.
It was kind of fun to scroll through various BPMs and hear the trigs misfire. Then I’d land on one that worked and it would be a release. Not sure I’d use that in a composition, but it is an interesting idea that’s subtly different than changing the speed of the LFO. Using tempo nudges while performing might unleash that effect.