Well, regarding audio: So far, all prototype units had the exact same problem with audio.
There were a few that have been more sensitive than others (stream crashing more likely), but ALL of them had a corrupted audio stream as soon as vibration had been enabled.
The proven solution for that is an inverter - which does nothing else than inverting the impulses form the clock. Shifting the clock would have the same result, as the clock signal is continuos.
What we did by removing the resistor was basically shifting the clock. So yes, basically, it IS very similar to inverting the impulse, and while the clock signal might not be shifted exactly how much it should be, a clock signal also has a bit of a tolerance.
So if it works with multiple boards which I've tested and the original issue is the same on all of them, it's very likely the fix should also behave the same for all of them.