When you say you set Ableton preferences latency - would do you mean exactly? I think there is only midi latency in preferences.
OK so I was expecting you to come back with this question about latency Didn’t want to confuse things too much at the start.
I generally use Silent Way sync rather than CV Tools clock and expected them to be about the same - but it seems CV Tools clock does give me a lot more latency than Silent Way for some reason… anyway - here is how you fix it…
You need to use the Ableton External Audio Effect module and place it BEFORE the CV Clock out.
Set Audio To > No Output
Set Audio from - whatever channels you are using to receive audio from VCV - I’m using 9/10
Set hardware latency amount such that they are in sync each time you stop/start - for me it is about 180ms which is A LOT. And this is with a block size of 128 samples in VCV and Live. I’ not sure why latency is so high but combination of CV Tools Clock, Blackhole and VCV Buffer I think…)
Here’s my audio going from VCV going out on 9 and 10
You could also use a midi track rather than an audio track for the clock, and use an External Instrument rather than external audio effect before it - this would allow you to send midi to VCV.