So to summarise the best of your suggestions seem to be
£££ Easton R90SL - 19.5mm ££ DT Swiss RR521db - 20mm £ Kinlin XT**T -19mm
Compared to (slightly narrower) options from a few years ago for my own reference
Are you using rim brakes or discs/track-no-brakes? The RR512DB is a disc-only rim so can't be used with rim brakes as it doesn't have a braking surface.
@Brommers started
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So to summarise the best of your suggestions seem to be
£££ Easton R90SL - 19.5mm
££ DT Swiss RR521db - 20mm
£ Kinlin XT**T -19mm
Compared to (slightly narrower) options from a few years ago for my own reference