A stock clutch will engage at 32 to 3500 rpms. The clutch springs dictate the engagement rpm. Stiff springs engage at a higher, weak spring engage at a lower rpm. With your old clutch, the springs are weak, worn out or possibly broken so you will feel engagement at a lower than normal rpm. You may not be used to the normal engagement range of the new clutch.
With time and a old clutch, the clutch bell gets overheated, blued and glazed on the contact area. If you did not sandpaper the clutch bell to remove the glaze then the new clutch will slip and not grab until rpms are considerably higher.
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