I think SS brake lines improve pedal feel and response, based on my experience. It's minor but noticeable. Others here who have installed them agree. I think for the price, they're worth it. I can't say that they will solve your problem though. I don't have a pad recommendation as I'm still on the Infiniti Motorsport street pads and I can't say I'd recommend them, especially if you're looking for track-performance pads.I actually ordered the brake lines when I did the rotors and when they went to install them, they had the wrong banjo bolt so they got sent back to Z1.
Brake fluid was changed then also, about 5000 miles ago. Think I should try the stainless lines again before changing pads? Any thoughts on the Z1 master cylinder brace?
IMHO, as far as the master cylinder brace goes, I'd spend my money elsewhere.