Is this a cheesy way to heal?

I used a potion of absorbtion and boots of grounding to get my electricity resistance up to 127%. Any thing over 100% actually does negative damage (healing).
I then found a tight corner in Durlag's Tower and used a wand of lightening on myself. The back and forth ricochet went through me about 20 times. Healed about 60hp in 5 seconds. Better value than a potion of regeneration, I'd say.