If I’m not mistaken the Escort mk4 has the steering rack behind the front axle. So if you get toe in on compression I would think the steering ball joint would need to be mounted higher relative to the knuckle to get more neutral bump steer. So in that sense your correction of the roll center should have helped already with the bump steer as well.

But since the steering arm runs quite a bit higher than the TCA you will always get some bump steer over the full suspension travel. So you need to make it as neutral as possible close to the normal ride height.