I decided to ditch the standard PCV as it was no good. Too restrictive.
Now I have made the hole, wherein the PCV used to be situated, into a hose connection, connected a 17mm hose to both camcovers and ran it into a K&N baffled oilcatch and integrated breather and routed the return through a 10mm hose into the sump by replacing the sump drain plug with a hollow bolt and a banjo connection on the hose. The engine seems to idle a lot better now.
I might upgrade further in the future should the need arise.