The photo that I attached previously is with the screw down jig attached, so the sag looks exaggerated by about a factor of 2. But anyway, since the sit bones are located at one end of the sag, it is on a downward slope. I have to reduce that slope to less than 2 degrees, otherwise I slip forward or put too much pressure on my hands. To get that slope, the nose will always rise above the level of the sit area and cause discomfort. It's the sagging nature of leather saddles. So I'm going to look for a plastic saddle.

I'm using a Thudbuster seat post which has 2 bolts on the rail clamps, so it's possible to make very precise incremental adjustments. I also use a straight edge and an inclinometer app on my phone to precisely measure the angle (assuming the ground where my tires are touching is level).

I just got hold of a few different Ergon saddles and will test them soon. (After I find replacement screws for my rail clamp. It stripped out after making a couple hundred adjustments and switching of test saddles). The 5 models have a good variation of stiffness ranging from extremely soft to very hard (in order of softness: ST core, ST, SFC3, SMC4, SM). All of them have a small 2-3mm dip at the middle bridge if you place a straight edge from the sit zone to the nose (A new B17 has 4-5mm, my 1500km Imperial has 8-10mm). I would have preferred if there was zero dip, or a step down like the SQ Labs, but Ergon doesn't do this. The more the middle dips, the higher I have to tilt the nose up to maintain a maximum of -2 tilt of the sit area. One nice thing is that Ergon changed their new models to have an option for a much larger width than previously offered.

Anyway, I'll report back after I complete the test. Meanwhile, I made some diagrams explaining the problems that I have, attached below. The SQ Lab 602 stepped nose and bridge is perfect for my perenium and testicles, but the sharp edge on the wings is a bad design.