As Darren rightly says, it's probably not a good idea to persist with riding it with this potentially dangerous fault.
In line with Darren's thoughts on the fuse box, are your fuses a good tight fit in the holder? Mark9 mentioned in your other thread that he uses good quality thick bladed fuses to ensure a good fit, as cheaper ones have thinner blades and don't fit properly.
A loose fuse would explain your misfire too.
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