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Gravity has no effect on closed loop, no need to add an extra pump in the basement. I have added 27 ft of 3/8" tubing to my loop and had no change in temps from it. If you can go with rigid tubing, gravity does effect tubing.
What are the goals of these changes, not satisfied with the performance?? You made 2 big changes when you switched from the apologee hd to the sniper. The block and taking those gts rads out of parallel, I thought you didn't mind the performance hit for the cleaner look?
The yellow is silver ions, cooper oxidation does not rub off with your fingers and is brown or black, and is actually good for the block. You can cut down on the oxidation by warming up the distilled water before putting it in your loop, at about 110f-120f the dissolved oxygen content is lowered...
What watercooling parts are you running besides the Koolace radiator?? I have read in a thread about somebody having 2 radiators blow out on him, a thermochill and a black ice sr 1 or gtx, he was running 3 ddc 3.2 on a triple top right before the rad.
http://www.guru3d.com/article/gigabyte-geforce-gtx-680-oc-edition-review/10
There are 2 680s on the chart one at 29 the other at 39, you have nothing to worry about!!
256 Watts of heat dissipation if you can evaporate 1 pound of water(16fl. oz.) in one hour. On days of low humidity I could get my i7 930@4.0 ghz(200 watts) down 10f below ambient, on days of high humidity 1f below ambient.
Biocides, silver works well( i used colloidal silver) as well as bleach...
Well you are pumping all your water thru the gts360 first, that would be your flow problem....
The gts is very restrictive, and the hd is a high flow block,.
You should reroute your tubing so that you are getting all your water thru the hd without restriction and only some of the water thru...