Was this reccommended by H-max customer service?

Generally speaking it is not wise to "up" the vaule of a fuse or (or circuit breaker). It is there to protect the wiring and other components and its failure is telling you something is not "right".

If you must alter the design it is acceptable to replace the fuse with a "slo-blow" type of the same rating, but that does not guarantee a more "sensitive" part won't fail first.

I never had a fuse issue with my Axe (and did not know one was even there). It is not mentioned anywhere and this is the first I have heard of its existence.

If there is one [fuse] there why did it "blow", burn, or otherwise cause a failure of the 3 in 1?