You need two different POD...
for a more stable Austian-Hungary, or better Austrian Empire, you need to prevent the Prussian rise (or maybe make lose the Prussian the last decisive battles for the Germany leadership with the Austria) and thus make the Austria the leading power in the Germany and the author of the Germany Unification and Hungary then can remain only a state of the Empire (one of the three, with Austria and Bohemia, under the direct rule of the Emperor). Without giving to the Hungary the same importance of the Austria (because for me this was the real beginning of the end for the Austrian Empire) the Empire will be much more stable and with a strong German barycenter the Austrian Empire will naturally much less interested in Italy and the Balkans.
For a fractured France you have five valid POD and all are between the 1100 and the 1600.
1) naturally make exit the England of the HYW much better than in the OTL (maybe with at least the entire Normandy)
2) a marriage between Franz of Habsburg, Duke of Burgundy (third child of Maximilian I and Mary of Burgundy, in the OTL died shortly after his birth, if he survive ha can easily become the heir of his mother territories) and Anne, Duchess of Brittany... .
3) combining 1 and 2. Thus you have the Normandy in English hands and the Brittany, the intere Benelux and the Burgundy (+ other French territories) ruled by a branch of he Habsburg family... I don't think any French ruler can impose his will and rule on the entire French territory or only in the territories who are supposed to be under his rule.
4) manage differently the English succession of Richard I: if he did not change his will almost at the last minute his main heir will be his nephew, Artur of Brittany (son of his brother Geoffrey) and not his brother John I. Thus Arthur will become King of England, Duke of Normandy, Count of Anjou and Maine and also Duke of Brittany (the latter inherited from his mother) and John will become Duke of Aquitaine and Count of Poitiers some years later at his mother death (inherited her lands). With Arthur as King of England and John only Duke of Aquitaine, Philip II will have no excuses to attack England, and also Brittany joined the domains of the English King: thus we have a very powerful and independent Duke of Aquitaine and an English Kingdom who include the Normandy and the Brittany and a French King who can't impose his will on his powerful Lords (not only the two Plantagentes but also the others) and probably with this the HYW will never happen...
5) the last possibility would be to kill Henry IV after he became King of France, but before he married Maria de 'Medici... this most likely will ended in short time (and probabily permanently) the French Monarchy
My favorite are 3 and 4.... both likely take away any true power from the hands of the King of France without destroy the French Monarchy...