I don't like the original ideas much, but I understand why they are being suggested.

More tries might mean getting the rewards faster, but I like having 2 weeks to work on one book, and being able to roll until my odds are best. If I tried that with a daily book, that's, well, begging for burnout.

Maybe the books should be a bit more customized, never contain anything that isn't unlocked by the level of your highest job.

Maybe the scrolls should be able to be upgraded, gold for 3 silver is a bit low, conversion rates always have a cost, I'd say 5 silver for gold, but watch the price of the gold rewards to see if they drop sharply.