Would the Phobia fit between the Ebonite Warrior Elite and the Columbia Sideswipe Solid?  If not, is there an EBI ball that would?

It should. I know the Sideswipe Solid is a lot more ball than you would think but the Phobia should still be slotted above it. And definitely below the Warrior Elite.

Thanks.  Was looking at this and the Ebonite Phenom Pearl but I think the Phobia may be the best choice.  Thanks again.

for me, these are all different motions

the Impulse solid is a longer, stronger motion vs the sideswipe solid (i have them drilled exactly the same)
The Phobia is cleaner up front and a bit more downlane than the sideswipe solid
the sideswipe solid is earlier and overall stronger than my phobia.
I have my phobia drilled with the  pin in the palm and its really controllable on the flatter patterns

I did a ball comparison on BTM
Impulse solid id earlier and overall stronger
Hammer Phobia and sideswipe solid are similar
OBB on the Phobia being 1000 + polish and the sideswipe being 3000 dull.
I haven't had the Phobia and the sideswipe at the same surface to get a good comparison with my eyes.
with both at OBB, the sideswipe solid is earlier and more blended motion off the pattern than the Phobia, which is longer and stronger arcing.
I have a summer league practice next week, I can put both at same surface and see what they look like.

I have all 3 and easily can carry all in same bag for 3 different looks