Natures Focus:
The primary target of your Chain Heal is healed for an additional xx %. (16% at 252).
This translates to roughly ~6% more healing done by chain heal since it only affects the healing on the initial target. Even with the 4 piece spitting out free chain heals, this conduit is still not very impactful compared to the alternatives.
An easy fix would simply be to make it a flat percentage increase to Chain Heal’s overall healing, which would nearly triple the effectiveness of this conduit, and make it a more competitive option.