Since you're already decided that Kaiser Wilhelm made all the right calls, and know the Italians would've attacked anyway, not sure why you're asking.
A few samples:
Kaiser Wilhelm - Dropping reinsurance treaty - wrong call, perhaps driven more by Holstein than him, but wrong to accept. May have been hard to continue to deriving practical benefits or guarantees from it however.
Kaiser Wilhelm - Going for Tirpitz plan on navy - wrong call, but probably not decisive as many think
KW - the Kruger Telegram - a diplomatically indiscreet comment, but really the British just being freaking hegemonic bullies turning molehill into mountain
KW - Yellow Peril drawing and rhetoric - pure nonsense and silliness
KW- the Huns comment pre-Boxer expedition- Stupid bloviation and incitement to war crimes
KW- "Shooting from the lip" in general - he was a remarkable media player pre-twitter, this didn't work well for him, was mostly used against him, and generally got international media watching for his next verbal screw-up. Not a good place to be.
KW-Idea of alliance with Britain good; expectation of Britain's need for a German alliance - stupidly overconfident
KW- Treaty of Bjorko - Good instinct and initiative, failed execution, probably due to lack of fully committed reciprocity on Russian side and lack of full commitment on German staff side. Could have save two crowns, 1 neck under a Crown, and millions of lives.
KW- Daily Telegraph Affair - Again with the indiscreet comments he should have kept to himself, but nothing in them was dangerous or threatening in them, to the extent Britain got huffy and more anti-German about them, that was their own fault.
KW-(and maybe officials too) - Balkan diplomacy in the otts and teens. Screw-ups and missed opportunities. Shouldn't have undermined Austria-Hungary in pig war of 1906. Under-invested in relations with Ottoman Empire. Especially in teens, far too optimistic about potential for alliances with Romania, Serbia, and Greece as opposed to Bulgaria.
KW- Blank Check- BLUNDER! Unnecessary, where else can the Austrians go? Any check should have had many lines written out in fine print of legalese with caveats and conditions.
KW's reaction to Serbian reply to Austrian ultimatum - 'No need for war' - Good instinct, better than Moltke and staff. But WIMPED OUT and didn't force an end to escalation right there.
KW's last-minute advocacy of east-first - Good instinct, better than Moltke and staff. But WIMPED OUT and didn't force the change. [If you're surprised I think this, this thread is all about giving the other side, which thinks it's so smart in its cycnicism, a good hearing]
KW wartime decisions and rhetoric - some VERY bad ones, including advocating for ethnically cleansed border strips of France.
...also some VERY BAD Downfall-esque anti-semitic rants written in his hand.