VST Live 2 only seems to show a subset of the available buffer sizes for core audio devices on MacOS.
For example, both the built-in MacBook Pro audio driver and my X-Live interface offer a minimum latency of 32 samples. This is also shown and selectable in Cubase 14 and other audio apps.
Vst Live 2 only shows 64, 128 and 256 (plus some higher latencies) - the 32 and 192 samples option is missing.
Maybe you can’t find, but I personally don’t think things will work crackle-free on 32samples (audios + midis + plugins + videos + DMX…). I think a rock-solid 64samples is an awesome performance.