If possible a diagram would be great! Or just take mine and alter it. Either way thanks!No. Adding the cap across the coil will slow the release.
Use a second set (DP n.o.) of contacts to route power to the capacitor charging it while magnet is "on".
When the release button is pressed, the relay opens and the capacitor is connected thru nc contacts to the magnet coil. Polarity reversed.
That may not be needed. Or just connecting the discharged cap to the coil may be enough.
Max may have a standard diagram. I'd have to draw one as google didn't find one.