Why does Cleave Space require Combat Slide in the first place? They have almost nothing to do with each other.
I also really miss being able to take friends with you via Cleave Space. That's a big part of what made it a useful blade skill. Self-teleportation is only really useful in combat, and even then it's kinda limiting. The range reduction is good (probably easier to understand than 1 use per 3 rounds, and requires less bookkeeping), but a scaling "take allies with you" would be nice. One ally per 3 levels would be fine.
Yes, let's buff the Soulknife's combat power without touching its noncombat utility. This will fix the problems the class currently has.
Also, the availability of Spheres of Power is not a safe assumption.
Or just implement Errant's current fix, which is a lot simpler and uses a heck of a lot less words.