Not in love with my system yet. Help!

I've upgraded my system quite a bit over the last couple of months and I received the components separately due to shipping delays. I got my Parasound Integrated first and all hooked up. It made quite an improvement. I received my B&W 606 S2's a week later. Happy but knew the arrival of the subwoofers I bought would really help make them shine. I received the first of 2 REL t7i subs and hooked it up as directed and the improvement in sound was astounding so I was ecstatic about the thought of getting the second which was a day later. That's where I ran into issues. I have a Denon receiver which handles the HT side of things. My mains are run through the integrated of course and the only source directly connected to the integrated is a Bluesound Node. I have been unable to integrate the subs for music only when I try with both. I can run Audysey and it did an amazing job for my HT but that doesn't do a thing for me as far as stereo. I have bought a UMIK1 and downloaded REW but know they aren't going to give me any way to correct anything. All of my interconnects are unbalanced (RCA) so not sure which unit I should get to help me along. I have looked into miniDSP but think it only has balanced in and outs. I'd like to keep cost as low as possible as wife is on warpath. What unit do I need to get? I get pretty lost in the forums sometimes sorting everything out so forgive me please for asking to shorten my time to get to my goal and going over things that have probably been addressed before. Much thanks!
What would we do without MC trying to make everyone look and feel stupid? It's his form of payment for dolling out advice.  
run four subs thats were I went in ht and am headed in dedicated audio from two 
@thecarpathian Because for stereo purposes it's supposed to be fuller and more balanced with two. I may end up going back to one but I'd like to get the most out of what I have if it's possible and it is supposed to be possible.