3.5" RC Lift on a diesel, need answers

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I wanted to add the 3.5" rough country lift on my 2020 Silverado 3.0, crew can, short box 2WD. I have the composite leaf springs and have seen that's not a problem, according to some. I've seen other brands tell you that there is a small wedge, not block, under the composite leaf that need to be removed with C-clamps for proper angle before using the lifting block in the rear. Rough Country does not mention it on the website/instructions. Also. i saw reviews on the RC website, and one person with a diesel mentioned that the sway bar rubs when doing the lift, and that RC sent them parts to drop it. If this is an issue, why is there nothing listed on the site, as well as options to buy the parts? I tried reaching out to RC for these 2 questions, and their response was "every truck is different". Either I got a bot, or someone that doesn't seem too familiar with their product and doesn't want a sale. Can anyone with experience give me some answers?

 

BTW: I like RC kit because it's affordable ($600) for the complete kit and lets me maintain all stock parts, minus the rear shocks. Other kits have more parts to change out, use super expensive coil overs, or don't include rears

 

3.5 Inch Lift Kit | Chevy Silverado & GMC Sierra 1500 (2019-2022) | Rough Country