I forwarded your feedback to the dev. team about adjusting the drop rates for spells in WoE.

They let me know that while it wouldn’t be impossible to adjust the drop rates, this would cause other items drop rates (coins, etc.) to be lowered, so from a balance perspective it would be difficult to do.

Also, the high tier magic scrolls have been set to a somewhat higher difficulty to obtain, and it has not been balanced so that you are guaranteed to learn the spell as soon as you reach the proper level.