Just to save anyone the trouble of reading all this crap...OP has q rack installed at yimi's shop. It shudders at low speeds. yimi says its rack. q rack sends new rack same problem. OP and yimi think its the rack again. yimi refuses to ship rack back for inspection. (even tho its not his rack) claims he is owed labor. This is usually not how shops get "paid back" for defective parts. OP writes silly comments saying "you weren't there" many times. Conclusion= racks are not the problem.
Solution have yimi sell me the first rack for $200. Its better than nothing and I've seen the DIY not that big a deal.
Solution 2 I'll take both racks and ship you my 05 sti rack as well for $200.
p.s I will video my steering to show it doesn't have any issues on my car.