just make sure to have adequate cooling for the amp chips. it's looking like you've ended up with alot of parts that have increased capabilities. you CAN overdrive amp chips to a certain point as long as you have the right cooling... kinda like going water cooled for computers.

infact, that being said... if the amp chips are just the right size, you might want to consider doing your board just right to allow for say... a small water block for a MOBO power regulator and use that for your chips if your tower is WC'd. you wouldn't have much worries about cooling flow in such a cramped space and you wont have degraded performance over time from heat soak.

just a couple ideas to throw at ya