Getting this message in log: [Client thread/ERROR] [IguanaTweaksTConstruct/IguanaTweaksTConstruct]: Could not set harvestlevel of item.scorchingPickaxe. Contact the Mod Author to properly support Item.setHarvestLevel().
should be easy to fix.

Can't support harvestLevel, the pickaxe has multiple of them that are handled automatically and won't work with anything that tries to change it. Any reason it's complaining?

Ok, then. It's just a minor output in log.