so check it out. i'm gonna go ahead and say it's a grounding issue, like you said.
whenever i'm dead stopped, the lights work 100% and shine true.
whenever i'm cruising over about 25 - 30 the right light will "pop" on and then start to flicker as stated before.
whenever i slow back down to dead stop, the right light dims and then holds steady, 100%.
sounds exactly like a grounding problem to me. now to fix it .......