And you are a "founder", I would say your luck is el crappola.
STK, I find that on the lower level characters it is MUCH MUCH easier to get the ring. And if you join a group that is looting and you are on a new character, I always seem to get one. Currently, we have SEVEN RINGS of FEATHERS. I have not really run STK for loot in a long, long time. I do not think I have even run STK on my monk yet, and my monk is almost 9th.
My one and only SUNBLADE came on a toon that was 7th level.
I thought the luck modifier was that die roll thing in the beginning. I have never seen a 20 on my screen, but I have seen 19s.
I have played this game since October 2007. I have pulled around 30 +1 tomes, maybe more. In my bank, I have one page devoted entirely to storage of +1 tomes, my library. But never have I pulled a +2 or greater tome. Most tomes are pulled on my CLERIC. And tome pulling does come in spurts. Good places to pull tomes, for me, are gianthold quests and From Beyond the Grave.
On my other characters I might have pulled a total of four +1 tomes.
Now, just for your enjoyment, on ANY of the RAIDS, I have never pulled a NAMED item on ANY of my characters. I look at others pull them, sometimes, people take pity on me and give me one, like the "tenderizer" from the Reaver. It does not matter what character I play, or what class, my streak has stayed alive so far.
NO NAMED ITEMS FOR ME on any raid.