you could always save your game before scribing the scrolls and reload if you fail and try again. If you consider this cheating then another suggestion would be potions that raise intelligence (If i remember there is a potion that raises your int to 25 (enough to scribe any spell with 100% chance) for 24hours at the carnival it costs only 25gp (although my memory is a bit rusty) you can always drink it when you have a lot of scrolls to scribe and then rest for 24 hours to get back STR.
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