FWIW, I've swapped to SS brake lines on two ZHPs now and honestly, I can't really feel much of an improvement. So, if you want to save the $125 or whatever they cost, then don't bother. A good flush and proper bleed (as stated above a few times) will be your biggest help. I too recently flushed to the ATE Type 200 fluid.
Also, this time when I flushed/bled, I hooked the car up to INPA and ran through the ABS functions to activate and ensure all of that was bled/flushed as well. Seemed to help with a nice stiff pedal...
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