You've got some serious power surges going in there!
Never seen an Ignitor module just blow up like that. See plenty of them "blow" in their fashion, but never one that had melted.
And do you know if the guy that replaced the old link with the two fuses has them both going to the same wire? In other words, are there just two spliced into one where the previous one was?
If so, I'm not sure how that would work, but in theory it should be fine, as current will pass equally through both. At least for awhile. If one fuse does blow though, or the connection of one wire is not as good as the other, then everything is back to flowing through just one wire and 30 amp fuse. And that won't last long.
Since a lot of these are occuring not long after startup, I wonder if it's possible that your alternator is overcharging for a few minutes? Since it's on that circuit that you're having so much trouble, it comes to mind.
Have you ever put a volt-meter on your battery when it's running? What voltage do you see?
The old fusible link was long gone by the time you got it, it looks to me. That yellow crimped connector is a giveaway.
I'd say that at least you have to search all the wires and look for a possible short like was said. If it's not the alternator charging too much, something is intermittently touching ground.
What year Bronco again?
Paul