-4* is all he can get? That's a ton of negative caster. You can usually get them cars up around 2* as long as nothing's bent or out of shape. The rear ride height also has an effect on caster, don't forget. If the car is sitting much higher in the rear, that will cut the caster down in the front a good bit. I've never been real keen on using adjustable strut rods for caster adjustment. That's adding adjustability where none was designed. You're simply counting on the "play" in the lower control arm bushings as a means of movement. That's just never appealed to me as the greatest of ideas. I think if I had to, I would install offset upper control arm bushings first. I'm not a big fan of those either, but it seems a more "correct" way to go, IMO. Keep in mind too, that you don't want a PILE of positive caster with manual steering. It will start to get really difficult to steer at slow speeds, because you will actually be picking up the weight of the car as you turn. Usually, they do really well around 2* or so.
