Is there an easy way for me to edit my clientside files to lower the requirement to cast level 8 spells? My creature is 399 and my life is 418; the life spells will get cast, and the creature ones will not.

No. I haven't tested this, but you could try replacing the level 7s with their level 8 versions (keep the spell name and ID, but remove the old 7s and change the level8s to level 7s.) It's a bit hacky, but it might work.

 

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Should remove that skill check all together. I get that on low toons sometimes, where if you try to rebuff, it wont attempt creature spells if your skill is too low for "lifetank's check". If you're already buffed, it works fine because it detects your skill as higher.

 

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That sounds like a viable alternative, I will try that after work tonight thanks!