According to the Server Merge Updates, there are a lot of factors that come into play when merging. However:

"Server Merging will be done in accordance to the number of players online and power level as selection factors.We have in our interest that every player enjoys the best gaming experience and social environment possible."I'm having a hard time figuring out how s71, s75, s77 and s81 are "within the selection factors." S71 - 85k+ PowerS75 - HIghest power is 60kS77 - 90+ playersS81 - 90k+ players

So how has s75 been "selected" to merge with 3 servers that all have over a 30k+ power difference.
Doesn't sound like Oasis has "every players best gaming experience" at hand.