Ballast resisters

If you have plugs melting that usually means you have a bad connection that is heating up. Dirty connections have more resistance which means they use power which creates heat. Clean the spade lugs both male and female. You can crimp the female side (the one on the wire) with a pair of pliers so it grips better. The tighter the connection, the better it works.

The 0.8 one will still work temporarily, but you should change it out for the right one as stated earlier.