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Hi. Sorry for the late reply. The only powersupplies I found can supply max 2.5 Amps. Even if they have a max poweroutput of 7 or 8 Amps they provide max 2 - 2.5 Amps per USB connector.
If you want to tune the raspy to its max power, yuo have to use a powersupply without a micro usb connector. the easiest (and cheapest) way is to use one of these step down converters. These can supply outputs up to 5 Amps. So you have enough power for the Fan, LED lights and much more.
If you want to use the USB Plug, there are many other cases for the Raspi you can use. This one is designed to use a step down converter.