the GIF is really good as is, i think the subtle pulsation will be perceived by the subconscious anyway, and u can always amplify it if u wish

No was the result of the rotation, it was stronger in the first try, I was able to reduce the effect and kept it as is now. I kinda like it, make it more "aliive"!

Should I try to remove it in full and keep the shield static/solid?

deSign_r

when i zoom in, it seems as if the shield of light has a subtle pulsation to it, did u do that on purpose? amazing work