[Royal Guard] Shield Spell Level 3 (But possibly all skill levels..)

Findings from a member of my community:
[color=rgb(255,255,255)][font='Lucida Grande', 'Lucida Sans', Verdana, Tahoma, sans-serif][size=3][background=rgb(37,19,29)]Two things about level 3 Shield Spell: one of the three spells, the defense and status resistance buff, does not work at all. Number two, the heal skill does not seem to be working properly. At 65k HP, I am healed ~13k HP with a +9 Valkyrie shield at level 150. What (I think) should be a ~24% Max HP heal is a ~20% heal. Not too big of a deal, but the issue lies further. With a +4 Rosa shield, I can\'t get the skill to activate at all! I\'ve used the skill literally 100 times in a row with each shield (easy to keep track of when its 50 SP per skill use) and I can not get it to activate with a shield lower than +6. On that note though, I do think the refine rate portion of the skill works: I noticed my +6 Rosa shield healed for ~11k at 65k HP versus ~13k with +9 Valkyrie.[/background][/size][/font][/color]

It may be possible that the skill overall may be faulty (noticed another report about level 1), so perhaps a review of the skill overall just to be certain everything is as it should be?