I'm trying to farm Lightning-Split Soarwood to upgrade some of my items with some Eldrith Rituals (you know, every +1 counts )

ddowiki and the crafting tool from DDO Lite Tools suggested farming "The Enemy within". I did this at least 10 times and got 1 Lightning-Split Soarwood out of all that alchemy tables in all runs. I also tried different difficulties from heroic normal to heroic elite.

Is this info still valid? Or are there other locations/quests to farm Lightning-Split Soarwood?

I also bought about 15 tier 3 collectable crates from the DDO store and got almost all tier 3 rares but Lightning-Split Soarwood :-(