How much power is enough for B&W Nautilus 804's?

Hello all ... from a recommendation in an earlier post, I went with bi-amping my Nautilus 804's (120 wpc Bryston 3B-ST on tweeters, 250 wpc Bryston 4B-ST on woofers). Per that post, plenty of power on the low end does wonders. It does sound great, but still find the bass not all that (bass player since I was 12 - a few yrs ago). In your opinions, would there be anything to gain by adding another 4B-ST to the mix on the low end? In bridged mode, each pumps 800 wpc into 8 ohms. Would I be doing anything other than putting my 804's into harm's way?

Your advice appreciated. Ed