Hey all, first post here. I've been doing a lot of reading on the Servo subs and had a couple questions. I currently have an SVS PCUltra 13. I'm about 70% theater, 30% music. But I like my music to be good when I listen

The SVS is a great sub and has a visceral punch to it without a doubt, but I feel like there's something missing. It just doesn't sound quite right to me, especially with music. I've played with room treatments, placement, equilization... nothing's done it for me. So I started reading about the servo subs and OB designs. So here's my questions...
1) I've read Danny comparing the PC13 and a servo sub as the difference between a bus and a porsche. Both can go fast, but only one can stop fast. I get that, but I wonder about the visceral impact of the servo subs. If I have dual drivers in the W OB shape, will two of those (so 4 drivers) provide me with something similar?
2) If I go with dual OB subs, should I colocate them or do they need to be separated? Because of my room shape colocation is a piece of cake. Not so much if I separate.
3) How directional are they? They would sit at about a 45d angle from my seating if colocated.
Thanks, and I look forward to learning more.
-Paul