Righty, you have an airlock in the rad which is causing water coming in the top inlet (as you currently have it) to pour down onto the water held in the rad... imagine pouring water out of a cup into a bowl and that's what's going on within your rad due to the airlock. The air can't get out the top inlet (air always rises) as the waterflow is coming from that direction.
You should always pipe a crossflow to self-bleed.... ie: water enters the rad at lowest point and leaves thru highest... this will eliminate the airlock problem and thus the noise problem.
Reasons: Air always rises when suspended in water... it always naturally travels upwards to the highest point... so if you pipe everything so that when the case is in it's final position water always enters an item at the lowest point and leaves at the highest point then airlocks will be minimalized / negated... stuff will flood fill from the bottom up so no air can get trapped...
Ideally reservoir wants to be above the radiator so that air doesn't rely on flow to carry it round to res... however in my experience if the radiator is piped correctly a single CSP-Mag can force all air thru and round to res even with res 6" below the radiator outlet (uppermost barb of rad in whatever orientation you have it in case)
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