BTW, did you try controlling the system/CPU fans via fancontrol or some other similar software?
Nope defaults seemed fine. I did replace the fans with Noctua fans; but I do that with every build. I didn't notice the default system fans making noise. I used these fans:
Also if you don't mind me asking, is there much control over fan speeds in the BIOS?
I can't confirm this right now (system is remote deployed across the country for backups). However, I seem to recall that it was a standard American Megatrends BIOS interface / settings; with standard fan reporting.