Many of them do have adjustments. The point is, this car has no caster, something is wrong with it. So the arm may be mounted too far back to begin with, moving it forward only puts it where it belongs (possibly). There are only two ways this caster is off so far, one that upper mount is leaning forward or twisted in someway that is moving the front of the upper control arm in or the back of the upper control arm out, OR this strut/locator is mounted too far forward. An adjustable upper control arm would be the cats butt.
This is why I say to be sure you aren't binding the inner lower bushing on the control arm, until that is investigated there is nothing much to talk about. Because if moving it forward is going to bind it, something else needs to be done.
That bar keeps the ball joint end of the control arm from moving forward or rearward, it has very very little to do with the geometry (realistically) It locates the ball joint, that is about it. Of course you don't want to move it a ton, but we haven't gotten that far in the discussion. That ball joint IS too far back, or the upper one is to far forward, so it isn't right now.