You could always make Lesser Euphoria and Greater Euphoria—maybe even give them separate names entirely. Cheer and Bliss, for two awful examples. I don't think you can justify dropping it, as is, to 3rd level. Do as was suggested, making the bonuses +1 and the penalties -2, and make it the lesser version, at probably 3rd level (kinda like a combination of Aid and Bane... with Daze thrown in as well as some... mind-affecting stuff? Bad simile. Anyway.), and quite possibly bump the current version up to 5th level.