SourcePoint 888 owners – low-end bass in open rooms?

I’ve had my MoFi SourcePoint 888s for a while now and overall I really enjoy them. They are paired with a Parasound A21 and P6 preamp. Sources are mostly vinyl (MoFi StudioDeck with MasterTracker) plus CD.

What I love:

- clarity
- separation
- dynamics
- clean sound at volume

What I’m struggling with:

I keep feeling like I’m missing some low-end weight and room-filling bass. Bass is there and sounds clean, but often it doesn’t feel as full or physically present as I expected based on reviews.

My room may be part of the issue:

- current room is approximately 11x18
- one entire side is open to the rest of the upstairs
- listening distance about 8 ft
- speaker spacing about 9 ft

I’ve already experimented extensively with:

- speaker distance from front wall
- listening position
- toe-in
- volume levels

Some recordings sound excellent and punchy, but many leave me wanting more low-end fullness and physicality.

Questions for other 888 owners:

- Are you getting strong low-end bass/fullness from these?
- Did room size or openness affect bass significantly?
- Did moving to an enclosed room help?
- Did any of you eventually add a subwoofer (REL or otherwise)?
- If so, did it “complete” the system?

Trying to determine whether:
1. this is mostly a room issue,
2. a setup/integration issue,
3. or simply the natural character of the 888s.

Thanks in advance.