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When I bought my Cali, I had intended to buy the Touring, but decided I liked the clean simplicity of the Custom, along with the superior rear suspension. One reservation I had, though, was the slight (6 degrees according to Cycle-ergo) forward lean, since I generally prefer a straight-up seating position on a cruiser. As it turns out though, that bit of lean shifts some weight from my butt to my thighs, greatly enhancing seat comfort. Combined with the proper density of the seat foam, I find the stock saddle to be all-day comfortable, as long as I get off for a few minutes every once in a while. If I was sitting straight up, I don't think that would be the case. So, the combination works well for me.
Very slightly leaning forward works best for me. Achieved this on my V7 by using a flat Airhawk cushion and sitting further back.
I've nursed a bad back for a full 25 years now, starting at the age of 42. I fully understand the bolt upright seating.
Bolt upright would be 0 degrees, as on the Touring and Eldorado.