plumbing advice

[Sasq40]

Trying to get my drain setup to be a little more quite. Right now I'm running a Durso(although an incorrect one because it's only 1" and I have to throttle it back with ball valves to get it quite enough to live with) Right now it's a corner overflow with a 3/4 and 1" bulkhead on each side. I've been running this setup for about a year but i just can't stand hearing the water anymore well watching tv. Here's a basic diagram of how my tank is setup at the moment. I should be able to get a return behind the tank if need be.My return pump is a aquaclear 110 that puts out around 900gph at 0'. Any tips appreciated.