Are the
coils exactly the same in the number of wraps and diameter?...are the post screws all tight?
Assuming yes, then I would squeeze just the hotter coil with some tweezers. That may slow the heating enough to match the other.
I had the same problem yesterday - I could not get two
coils of exactly the same size and number of wraps to fire evenly. I checked to make sure that the screws were all tight, but could not make it work and ended up replacing the hotter coil.