I dont have or use OXI at the moment. But in general theres only 2 settings when it comes to clock.
- set your sequencer to output clock and transport
- set partner device to receive them
Hearing that you got it working 50% of the time is great news!
At this point it is because to sync inconsistency.
It happens more or less due to of laws of physics, and there will always be some clock drift and catch up.
Testing 1st trig for this is tricky, as it will most likely always skip on fresh start of both sequencers (but should return to normal after first loop). Because even if you nudge p-lock microtiming to the left, it cant activate itself on its own prior to you pressing play.
Solution for that is to microtime your first OXI note a bit to the right.
Other than that, if your p-lock on step 10 is consistent, you are pretty much done.
If not, microtime all p-locks one notch to the left.
My thoughts on this - if you want to use p-locks, theres no better sequencer than DNs internal one.
If you already program locks there, you might aswel drop notes in.
Im not sure if OXI can do it but if you can sequence program changes, probably better to use DNs sequencer lanes and just send program changes (to change patterns) on it.
For me this technique is useful only as a stepped LFO for long sounds.
For fast pieces i would always use internal sequencer.
But experimenting is key. So, hope that helps, and good luck 