A:AnswerYes - This 240mm AIO will fit into the case you called out, but no, I don't believe the Phanteks case fans will plug into the Corsair Fan/RGB Commander that comes with the AIO. If you don't care if the fans aren't RGB Phanteks does sell their own 240/280/360mm AIO solutions, but I really liked how easy this Corsair AIO was to install and wire up.
A:AnswerThe fans that come with this can only be bought with an AIO. You cannot match the fans separately, and the included RGB controller can only control one model of Corsair fans at a time. I would look into LL120 to replace the fans that come with this and for any additional fans.
A:AnswerYou are correct... Not normal! I would first make sure you have registered your product through Corsair (if possible), or at least have proof of purchase. Then you need to start some troubleshooting and fault isolation... I'd swap the bad fan connector for a good fan connector to see if the problem moves with the connection. This will determine if the bad fan is having a power issue, or if it moved with the new connection (where the good fan was connected). This will also help determine if you are having any issues with the Commander and/or a bad fan.
This AIO comes with ML series fan and because it is a magnetic levitation fan it may wobble a little bit, but probably not as much as you may be experiencing. Once you have isolated all of the bad components you need to contact them right away about a warranty/RMA on the fan/components in question. Good luck with the troubleshooting and (hopefully) warranty repair!