Unfortunately, while I was troubleshooting running it for about 3 minutes, it caused the plastic to start to melt at the heat sink side.
However I tested it with a resistive element and it worked perfectly still luckily.
Oh is there? Could I run a SCR controller at 100% (I have a few spare laying around), which in turn powers the coil or would that cause much badness?
I don't have a oscilloscope or isolation probes and I don't (yet) have the knowledge to introduce a capacitor into this project. But I'm reading to try and understand what you mean better 
The next simplest option I can think of in the meantime is SSR>mechanical relay. Unfortunately, however I will have to increase the duty cycle of the relay so it doesn't wear out too quickly or cause issues.
I am not PWM'ing it, however I would have liked to, hence the SSR and which is why I will persist.