The tools/weapons you would be able to make with those alloys would disagree.
The crossbow I'm currently using, made with Signalum, and some enderium bolts does upwards of 100 hearts of damage. :x
If you were to enable these materials in the config, there would definitely need to be some adjustments made.
I was simply suggesting instead of nerfing the stats outright, you could make obtaining them a long term goal. :)