To be honest, I haven't used Red Death since it came out during TFS. Partly because the catalyst didn't drop until Act 2. The other reason being that it's a Solar weapon that didn't run with Incandescent. To put it into perspective my Legend Adhortative has a better roll with Enhanced Heal Clip, Enhanced Incandescent, and Nano-Munitions which adds extra ammo when near allies.
Red Death heals on kill...big whoop. Catalyst causes massive healing blast...big whoop. Add Incandescent.
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Healing is fine. Not every solar weapon needs incandescent. 🙄