Hi Christos,
I'm running 10.9.4 on E6530 well..
1. Fan settings - you could try in bios ..choose a different setting - I dont see this isse
2. My exts have changed a lot - i can send a copy if you need
3. mine run hot as well.. it is normally because optimus is turned off and ur using the nvidia card all the time..needs more power
4. You can try 10.9.4.. U will have an issue with audio.. i'm using the VoodooHDA which works fine...