Well, more turns of smaller wire "might" yield a stronger magnetic field, it all comes down to the number of ampere turns on the coil. For the same applied voltage, that statement is not necessarily true as the smaller wire and more turns will have more resistance and also more inductance. This will result in less current flow at a given voltage.
Also, the fact that the coil is lower now due to melting has significantly reduced the magnetic force, the force drops as to the square of the distance, so a small gap can have a large effect. That coil used to be slightly above the track plane, now it's visibly below the track plane. That has had a major effect on the magnetic force to the couplers.
