what you meant by long arc??? just keep electrode little above from work piece?Longer arc, and you don't want to chip off all the way round, just here and there, wetting the rods will cause embrittlement through hydrogen too...
what you meant by long arc??? just keep electrode little above from work piece?
for porosity, high current would be good or lower one??Keep it as far away as you can whilst maintaining an arc, usually 10mm would be enough, run on upper current limit for rod too...