First fix the top problem man :lol:. Anyways I think you will have to get a GPU cooler that has the heat-pipes away from the card like the Spitfire, as no other GPU cooler will fit in that small gap between the 2 cards unless you want to reconsider getting a water block + water cooling system.
Also the Spitfire can be installed in reverse position so that it won't block ur Venomous X, but then it might hit your PSU. Problems ... Problems ... Problems ...
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This card -SPARKLE Calibre X460G