Ah, Vader Saders, one of my favourite decks. This is the version I used in my recent Trials final, winning both the games I used it in and proving its worth against an Earthquake duo and a Dimensional Shield duo.
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Limited to 23 upgrades, I opted for a quanta split between my pillars and pendulums.
Blessings make an excellent addition to this deck, but I brought Miracles instead for extra survivability. Flying Vampire Daggers make perfect Blessing targets, as any Crusaders that use their endow ability on the buffed Vaggers will also inherit the +3 damage boost.
You can win more Vampire Stilettos from AI3, but the low level arena decks may also prove valuable farming areas (especially with the chance of winning rares from arena special spins.)
With your extra electrum, while Dark Pendulums are my quanta source of choice (with a Light mark), any upgraded quanta source will benefit your deck. Pillars/pendulums are usually always a priority upgrade target in most decks. Flying Weapon is also a strong upgrade choice once you pick up more Vampire Daggers, as a couple of Animate Weapons will allow you to get several more weapons onto the field.