It's not fundamentally the angle of the tie rods that is the problem causing bump steer, it's the relationship of their angle to the lower control arm angle/position and the strut top location. It's the motion of the front knuckle/upright relative to the steering tie rod that produced bump steer. The only way to fix it for sure is to measure and then make a change. I doubt that the Tegiwa rack raisers will fix anything, and will likely make it worse.
Going to a wheel offset closer to stock will reduce your scrub radius and likely improve the steering behaviour, see if you can borrow a set of +45 offset wheels and see whether it makes much difference.
It is the front camber that is affecting this behaviour, but the amount you have is not excessive so I'd look for a solution elsewhere before reducing negative camber.
You could fit aftermarket strut tops at the front to increase the caster, like these:
http://dvrace.com/caster/ I've used a set like these on my DC5R and noticed an increase in straight line stability under acceleration due to the added caster (with -5° camber and 17x10+18 wheels).
If I were in your position I'd start with the wheels, and then add some positive caster, and after doing those two things then get someone to fix the bumpsteer properly, not with garbage parts like those Tegiwa things.