Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Granted it may not make a massive overall temperature difference but neither does that extra 100 MHz or 0.1Vcore so to quote Tesco's "Every little helps"
If you are in this for the aesthetics then by all means fit the loop in whichever order looks best but for pure performance everything in...
Why would you pump water from a hot source back into your res? The hotter the liquid the more effectively the rad will remove the heat. Flow should go: Reservoir-Pump-Waterblocks-Radiator-Reservoir.