Der Chef der Fahrzeuge
All you had to do was ask!At some point I found a chart which showed the front axle weights and possibly some spring rates for the solid axle F series front springs. I will see if I can find it. I agree though, most aftermarket spring kits are way to stiff. They are targeting those who want more lift, and don't want to get complaints about body roll or loose handling.
Pg 49 for '19 Ford SuperDuty pickup; https://madocumentupload.marketingassociates.com/api/Document/GetFile?v1=4448972&v2=082218092022&v3=60&v4=3a356440177318e6661ce4291a1c606943fd66e39b5e8d79ceb4e67b&v5=False
Pg 61 for '19 Ford SuperDuty chassis-cab; https://madocumentupload.marketingassociates.com/api/Document/GetFile?v1=4448983&v2=082218092443&v3=60&v4=38f8030153407e24633f589da7df71bb3eaa21ea896c45ec7d49ee10&v5=False