I'm not a crafter, so I can't tell you which weapons to craft. I can, however, tell you which traits to look for in a weapon and which weapons have the best damage over time.
You're looking for swords weapons, which is good. The single weapon in game with the best damage over time is the ornate axe. But in order to get the full advantage of the increased damage, you have to have at least 150 stamina (not dex) and 25% or more SSI. But even at less than full speed, the ornate axe can be an exceptional choice of weapons.
The rune blades, on the other hand, are also a great choice for a two handed swords weapon and swing slightly faster than the ornate axe. At less than max SSI, the rune blade can be a better choice of weapons than the ornate axe.
The best thing about both of those weapons is they both have disarm as a special move. But that's a different subject. For fighting the monsters, disarm usually isn't that great.
Now, for the traits you seek. Damage increase is a given, but if you're a crafter crafting it, you get DI automatically, otherwise, you can easily compensate for lack of DI on a weapon by having DI on jewelery, gloves (stormgrip, for example) and a talisman (primer on arms damage removal)
Swing speed increase (SSI) is probably the most important trait for any weapon with a swing speed higher than 2.5 (swing speed is max at 100 stamina for swing speed 2.5 weapons, so SSI would be wasted).
Mana leech is very important if you don't use wraith form. If you use wraith form, mana leech from a weapon is practially wasted.
Stamina leech is the number 2 most important trait on a weapon, since your life depends on how fast you hit, and how fast you hit is determined by how much stamina you have left.
With just SSI, mana leech and stamina leech, you have what many consider the "perfect" sampire weapon. But other traits, such as hit lower attack, hit lower defense or a spell effect make it even better.
My favorite wraith-form weapon just had SSI, stamina leech and undead slayer properties. I could collect demon bones in Doom faster than I thought possible, and with a demon slayer weapon, even the bone demon was little trouble to me.
