The standard fee at this moment is only 0.005BTC. To launder 1BTC without paying suspiciously high fee will take 200 transactions. You can't put these into the same block or it will become too obvious, and you need to generate more than 100 blocks for laundering only 1BTC. Even worse, the FBI may just monitor all unconfirmed transactions on the network. If they find many "hidden transactions" that were not broadcast to the network before they appeared in a block, they will further investigate that particular miner.
Lol. Have you ever heard about TOR?
You have no idea about the system I proposed. I said that you, as a meltmining pool, tweak the bitcoin software in order to prevent the meltmining transaction to be broadcasted until it gets added in the block you found.