The SVS SB-1000pro was a consideration a while back but still think would be too big for my room especially going two subs. I get the performance aspect of it but I really don't need anything lower 30hz since this is just a 2 ch music only system.
There's no such thing as "too big" unless you don't have the physical space. Those are small subs, smaller than the one you have. They don't have very much power. They have level controls. You can reduce the output to integrate them with your speakers. They're only going to be "too big" if you don't adjust them correctly.
If you can let the subs coast and aren't pushing them hard, then they are less likely to distort. If you're going to use a sub, why not get one that is capable of producing all the bass that's in some recordings?

