Change the text of the soothing touch power to the following:
Soothing Touch - Gnome Racial Utility
Your hand glows dimly, and a small wound on you or an ally mends itself with a touch.
Minor Action - Melee touch
Target: You or one ally
Requirement: The target must be bloodied.
Effect: The target uses his or her second wind without taking an action. The target does not gain the defense bonus normally granted by second wind.
Granting surgeless hit points is always iffy, and powers that do grant hit points without healing surges should be daily powers or very weak in other areas. The only way outside of powers for a character to grant another hit points is by making a DC 10 Heal check as a standard action. Having the power require the target to use his or her second wind makes this power a better option than making a Heal check (once during an encounter) but still puts the power on par with other racial powers such as a dwarf's dwarven resilience power.
Change the text of the benefit of the Expert Lightbringer feat to the following:
The target of your soothing touch power regains 2 additional hit points and can make a saving throw. The additional hit points increase to 4 at 21st level.
With the change to soothing touch, Expert Lightbringer as it was became severely less useful, since you can now only use the power once on a target during a combat encounter. With this change, it makes the feat useful by giving it a solid bonus to the healing and a saving throw to make it versatile.