one of the early pioneers of the oil-fed ims bearing concept (perhaps even the guy tuneRS bought the idea from) developed his idea here (LONG read):
Who has done an IMS change (New Oil Fed Design Idea) - Pelican Parts Technical BBS
so, some testing results. one thing that gets missed, however, is one of his theses that the bearing is actually unevenly loaded as installed and that moving it outboard improves the loading of the bearing and might reduce failure.