Sitz Bones "parts"

[OakLeaf]

I don't feel "pulled apart" on my saddle but I keep finding myself rolling forward towards my public bone on a long ride, leaving me quite sore.

My guess is either shape or tilt, maybe both. If it's level, try tilting it down a touch. If it's pear-shaped, try a T-shaped saddle.

And, personally I never felt "pulled apart" on a too-narrow saddle, just chafed and blistered miserably.