I've got a FLB Herc Axe. It's a small improvement on Dart for overall damage, but it's 4 turns for that first 30% debuff and I've got no affliction resist down to help the Eidolon 12.5% land on turn 7 - SR eidolon burst effects don't stick frequently. Running Herc with Sniper Shot gives similar results for me to Herc with PF. I've not got a FLB Shingen bow in Thunder yet, I'm hoping that will give me a better result, possibly with Sniper Shot again on the bonus rather than the new Shingen-only bonus ability boost. I've also got a long way to go on Ragnarok Raids before I can unlock my first 5 accessory Thunder character.
The aim is to get two lb3 or one lb3 and an mlb; lvl 125 on the Orichalcum thunder Glaive (treasure sword Crusos I think) using just Orichalcum, and lvl 150 on the Eye-mat-shop thunder Glaive using Tower for weapon breaks; I've got 17k unspent as I've got no suitable target weapons since last tower. The slow point here is going to be eyes, even if I don't awaken anybody else it'll take months (on 5 eyes now). The only droppable Thunder glaive is I think Karin's summon, which is pretty long odds, so without resorting to one SR in my grid or a seriously lucky draw of Karin or a 2nd Phantom Glaive weapon, this is my only real hope. This leaves 3 slots, which will be one fbl Thunder gun of Gluttony, one flb Gluttony lance, and my flb Ukko axe (eye-mat-shop weapon)
(edit - clarity)
But I've only just noticed - this event runs into September. I can do some reworking of grids, take down a few dozen more raids for soul weapons, and try again. In reality I'll have to - my score won't keep me in top 500 beyond this week. Every time I think I'm in a good place to cut back on the grind, the game pushes me back in....