ARC KS 600.2 settings for 4 REV 10s

Recently added an arc 600.2 to power my 4 REV 10s. I've been doing some tuning but I'm not sure if my installer has the right settings. I myself put the frequency around 70hz, have the button out for X1 setting, set on high pass, I have the gain about 3/4 of the way up and it's running to an WS-420SQ. The speakers are ran parallel so should the amp be set on stereo, bridged, or mono L R ? This speakers sound awesome but I'm a sound junky and probably going to add another 600.2 to get them at 400watts a piece instead of 300. Another quick question. If i do add the second 600.2 how do I wire things up and what setting would the amp be in to get the 4 ohm 400watts per speaker?

Thanks!

I have mine set on stereo. If you add a second amp just hook it up normal to get the 400 watts. The amp senses the load. 2 ohm gives you 600 x2 4 ohm gives you 400 x 2

So everything else on my settings seems good to go?

Yep as long as you set the gain using the wetsounds set up and tune procedure you should be good to go. I have the same set up and love it