Nice find. Is that Adrian's video? He wrote me some time back and he explained he did this to his car. It seems some of us have this issue where high amount of fuel vapor needs purging and it becomes a problem.
In my case I came to a conclusion of sorts as to why it happens or not that goes as follows.
The N80 valve modulates on/off in rapid succession to avoid excessive fuel vapor from leaving at once, this takes place mostly after refueling. If too much is released it usually makes cyl 2 misfire in rapid succession as that is the cylinder closest to the port. This eventually trigers a CEL. This happens less on the OEM PCV because the inner flapper restricts vacuum pull AND it is combined with oil vapors from the PCV at the same port.
PCV plates have a dedicated vacuum port and so vacuum is stronger and nearly unrestricted, only held back by the N80 modulation which doesn't appear to slow it down enough. I can usually avoid the amount of misfires by avoiding idle time right after fueling up. Sometimes I have to idle at over 1500+ rpms the first couple of minutes if caught at traffic lights or so.
At the end of the day it seems there is a mechanical balance of sorts. Too little will give you a purge flow error, too much will give you misfires. Once purge has taken place it is no longer a problem until next fuel up. E85 seems to misfire less than 93 Oct.
I have questioned in the past why the Spulen PCV valve comes with a N80 hose that collapses under vacuum. I think this may be part of the reason, besides cost. I get less misfires using theirs than a better quality non collapsing hose.