Here’s my altered versions of your crawls. Some of these sentences I changed might be too long for a text-card crawl though.
Episode I:
A galaxy divided! The Republic fights to regain control of the galaxy as more systems join the Separatist cause.
Crime Lord Jabba the Hutt has unexpectedly requested aid from the Republic, as his son has been kidnapped by a rival band of pirates.
Hoping to bring peace to these corrupt Separatist planets and the Hutt Clan, the Jedi have accepted Jabba’s desperate request…
Episode II:
Separatist leader Poggle the Lesser has returned to Geonosis, retaking the planet from the Republic’s control.
Using the planet’s vast resources, he has created terrifying new droid factories to fight the Grand Army of the Republic.
The Republic now dispatches their armies to recapture Geonosis and shut down Poggle’s factories once and for all…
Episode III:
Showdown! Anakin Skywalker and Obi Wan Kenobi have clashed with Asajj Ventress in the Sullust system.
Ventress has received intense training from her master Dooku and has grown strong in the Dark Side.
Darth Sidious fears that Dooku and Ventress are planning to betray him, and has decided to remove Dooku’s assassin from the war…
Episode IV:
After another clash with Obi-Wan Kenobi, Darth Maul and Savage Opress were left for dead and stranded in space.
Though they were heavily wounded, the brothers were saved by Death Watch, an exiled group of Mandalorians led by warlord Pre Vizsla.
This feared organization shares a similar hatred for the Jedi and Obi-Wan Kenobi…
Episode V:
Several years have passed since Padawan Ahsoka Tano became the apprentice of Jedi Knight Anakin Skywalker.
Her skills far surpass those of her age and sometimes even rival those of her master.
However, in the depths of Coruscant’s underworld, a dark plot is brewing that will change Ahsoka’s life forever…
Episode VI:
Before the rise of the Empire, the Republic struggled to end the fabled Clone War.
Jedi Generals were dispatched beyond the core worlds to fight for the Republic’s survival.
Moments before the historic attack on Coruscant, Obi-Wan Kenobi and his clone forces were struggling to win a battle on the planet Yerbana…
And about the file size, either size is fine. I suppose 5-7 GBs would make them more easily accessible, but if it hurts the quality too much I’d just go for the larger size.