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The Horizon were nightmare with tubeless as they’re ancient compare to modern tubeless, and yeah the Rampart I found them equally wooden with the 700 x 38, but really work better on 650b on account of smaller wheel = less weight for similar volume.
Look into the Vittoria, I think you may find them surprising as the centre is perfectly smooth and felt similar to a road tyres at a slightly higher pressure.
I have a pair of Horizons in the shed, they felt ok, but for some reason the sidewalls kept weeping sealant, maybe I didn't ride em enough or used the wrong sealant.
Had a pair of Ramparts (700c), just felt wooden.
I'm gonna wear these gks out before I spend more money on tyres, although I did enjoy the feel of Ultradynamico cavas, so if they ever come back in stock may give em a go in 650b flavour.