To confirm, there is nothing special about Novak solder, it's lead free stuff as you'd expect.
And also to confirm your problem is 100% defo tip size. To explain it another way you need a tip with enough size to store the heat so when you connect to the wire and the heat is transmitted the amount of heat stored is enough to melt the joint. The pencil tip is designed for circuit boards where not much is required but on our stuff the wire conducts all the heat away so the large tip has the store it up to overcome this.
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