Dave;
First, I wonder what manual "recommends" 30A fuses. Both the owners and multiple shop manuals I checked do call for 35A.
Second, installing a higher rated fuse would DECREASE any heating, since a fuse also works by resistance heating of the internal element, and a fuse of a higher rating actually has LESS internal resistance (heavier element) to allow more current to pass until its limit is reached and it burns open.
Yes, you have a poor connection, but it doesn't have anything to do with the fuse itself! Your hot fuse is caused by resitance heating of the fuse connections and fusebox contacts...nodowdaboudit!
Cheers
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