I came to the Clarity from a stickshift so I like the car to slow down noticeably when I take my foot off the accelerator. Hence I drive in Sport mode with max regen enabled all the time. But I’d say much depends on your terrain. I live in hilly area with curvy ups and downs. I like one pedal driving it all. But if I lived back in Florida with endless straight flat roads, I might prefer regen off and drive in Eco.
Like you, I've been driving manual-shift cars before coming to the Clarity. I think the + paddle should be able to take you into a zero-regen, free-wheeling mode. Sort of like coasting in neutral.