Wotcha and welcome - Do love a hatch me - this months Jap Performance mag as free tuning guide for the Scooby hatch, full breakdown of suggested changes - most important is a remap to avoid ringland failure if you are still running standard internals.
When I owned a PPP STI hatch (predecessor to the 330) I contacted Subaru about the failures and was assured the remap done by Subaru along with the other PPP changes addressed the lean running on pot four, however according to JPM this is not the case.
So for peace of mind I would recommend getting that done by a reputable after market tuner Andy Forrest etc