The current wording for LoH’s description says it can stack up to a maximum of three casts worth of shielding. With LoH+2, I casted Bless+2, followed by 2 LoH, thinking I could cast a third, but this simply resulted in a used charge while I remained at 45 shielding. A slight tweak in the wording—something like, “Lay on Hands can be cast repeatedly, applying up to a maximum of three times the shielding”—would be helpful I think. I remembered the “three cast” part so I was confused initially.