)
Regarding the loop setup there is not much you can do to optimise temps as the order of the loop doesn't particularly matter with temps. For the loop order all I can recommend is making sure you have the blocks connected with the recommended inlet/outlet ports for the flow and to check how the CPU block heatpaste is as the loop doesn't appear to have any major issues. Even these are a long shot to significantly improving temperatures.
The main way to optimise your temps is to add more radiators and ensure your fans being used on the radiators are optimised for radiator use (Good static pressure).
Other general optimisations are to makesure you have a well placed drain point (Or quick disconnects) and if you are going with the drain port make sure their is a place where air can enter the loop when you need to drain it so the fluid will drain out faster (Trust me on this one, it will save you a lot of time and hassle
Regarding the loop setup there is not much you can do to optimise temps as the order of the loop doesn't particularly matter with temps. For the loop order all I can recommend is making sure you have the blocks connected with the recommended inlet/outlet ports for the flow and to check how the CPU block heat paste is as the loop doesn't appear to have any major issues. Even these are a long shot to significantly improving temperatures.
The main way to optimise your temps is to add more radiators and ensure your fans being used on the radiators are optimised for radiator use (Good static pressure).
Other general optimisations are to makesure you have a well placed drain point (Or quick disconnects) and if you are going with the drain port make sure their is a place where air can enter the loop when you need to drain it so the fluid will drain out faster (Trust me on this one, it will save you a lot of time and hassle
(I been doing water cooling from the very first days which used ford escort heater radiators and windscreen washer pumps etc. OH Happy days lol) I was looking to see if I had made any mistakes on the loop. Anyway I found the trouble centre fan on my rad has ceased to function plus I set it up pulling air through the rad instead of pushing which I do find a better system. My temps now aren't excessively high 35-37 deg @ idle and 65- 74 deg under load, they were 27-30 deg idle and 60-68 under load.
Well, the best thing when building a PC is hindsightThanks TechMinerUK
I do know this
Hopefully when I change the fans etc. they come down a little bit.
One other thing what do you think of the build ? I bet you have thoughts on improvement
) My only recommendation would be a 240 radiator at the front and maybe have a look at re-doing the cables around the 5.25" drive bays. Other than that everything looks great 
) 
