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To each their own... but I think fused distribution blocks are garbage... along with glass fuses... for high current systems they just don't cut it. Create more resistance and issues that they do good.
I would still suggest running a reference ground from the deck to the amp, try 8 ga, try 4 ga... if the noise gets less with the thicker guage wire, then keep stepping it up. I know it sounds stupid but I have seen vehicles that you just can't get rid of the engine noise and in one case I had to run a 4 gauge reference ground from the back of the deck to the amp.
Also try running a ground (4ga or more) from the battery to the amp (outside the car - just to test), try running another set of rcas from the deck to the amp just over the seats to test it out. Unfortunately, there are a lot of factors that could be affecting this and it's trial and error until you figure it out.
I've known some pioneer headunits to have issues with grounding of the rca outputs... you may want to look into this for your headunit as well. For the heck of it... try another headunit if you have one kicking around.
Hope this helps,
Nick
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