Added alliteration aside, how do the different Flourish lines perform against our tubby little friends in the furthest depths of the clockworks? I know the procs are worthless, I'm just asking because I'd rather prefer to pick my blades based on vanity if I can get away with it. Alas, two hits versus three makes a world of difference.
Is the charge attack on those things worth anything? If not, I guess I'll go with ASI. Medium shouldn't be too hard to find, right?
I discuss the four piercing swords in my detailed sword guide, here. I have all of them, and I agree with the conventional wisdom that the statuses aren't worth the lower damage.
You are right that 2 vs. 3 strokes is a big difference. But the number of hits required to bring a monster down depends on the depth, your damage bonus, the size of the party, whether the monsters are hurt yet, etc. So it's hard to optimize the strokes-per-kill.
Against devilites and greavers, I use the first swing, then shield, and repeat. This is highly effective. It was even better before the length of the piercing swords was stealth-nerfed sometime last year. :(
Against trojans, silkwings, and all beasts, I frequently use the charge attack. The BTB charge is safer against a crowd, but the FF charge can do massive damage to multiple monsters, if they're closely grouped. On one occasion, I took out three wolvers and two gremlin menders with a single charge. So, no, the charge attack is not worthless, but focusing on ASI is not a bad idea.