I have yet to find a glove that keeps me warm in 30 or below temps, other than Ski gloves. Any bicycling specific gloves I have tried have come up short. The warmest bicycling gloves were the Lobster type, but I can't use those and shift with my hands on the hoods (Campy).
Short version - Ski gloves!
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'11 Time NXR Instinct / '79 Paris Sport by Moulton