Pardon the vernacular, but amp shields just plain suck in this game.
An absolutely pitiful amount of amp damage with a drastic penalty involved.
Hell, I would settle for continuous amp damage applied till the shield was drained.
That would at least add to the concept of glass cannon and make the shield interesting and useful in some circumstances.
As they are now they are just totally worthless and the small amount of amp damage doesn’t even help in a one shot sniper attempt.