While the nationalities during Tito's time didn't hate each other per say, the centralist views of the Serbs continued to manifest itself, but not in the people, but rather the pro-centralist Serbs that were in the government, such as with Aleksandar Ranković, the chief of the secret police until 1966. A PoD at the very start of the formation of Tito's Yugoslavia (if not earlier during WW2) would be needed to subvert the power held by the pro-centralists. Pushing the more liberal wing of the party, including folks like Vladimir Bakarić, Petar Stambolić and Edvard Kardelj, much much earlier (early 50s rather than OTL's mid-60s) would probably go a long way in promoting the need for the "federation to federate," and from there begin further decentralization and reforms.
However, even with a PoD that pushes the federalists' views earlier and makes it what the government follows, one would still have to appease the pro-centralists in some ways. Unfortunately, the only way I could imagine that happening is by appealing them with nationalism. For instance, while most of the Kosovar Serbian refugees returned to Kosovo after fleeing the fascist Albanian government established by Italy during the war, not all of them were allowed to return. Allowing them all to return could be one move towards pacifying the pro-centralists for the time being.
Another slightly more minor point could be the appeasement of the peasants. Collectivization very much messed with the traditionally agricultural populace that lived in the former Ottoman territories, dealing a major blow to the peasants, especially the Serbs and the production of their pork. It doesn't take much to point out that the only
peasant rebellion in Cold War Europe happened in Yugoslavia. Reacting during one of the minor protests that preceded the rebellion in order to get the peasants on the table, and thus get rid of collectivization completely as part of the reforms (returning land to the peasants, and if that land used to be owned by a landowner, give it to their peasants), would surely get them on the government's good side, more willing to follow its doctrines. A balance of peasant and worker would be needed in the development of the state ideology, perhaps leading to a peasants' self-management alongside workers' self-management.