top radiator fan for Fractal Design Core/Focus G and ram coolers not colliding

I got a 240 and 280 radiator. The top fan is an Alphacool Susurro 120 and a filed PureWings2 both with Susurro rubber condom. The BeQuiet fan supports one of two pairs of dualchannel ram. Its static pressure is too weak. I don't want to cut into another 18€ fan whose rotor may be bigger. A custom mount with a 92mm fan would support all four ram. Is there any 92mm fan that is able to perform like a decent 120mm fan silent?
 
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