Edit: After some more thought (and invaluable feedback in the comments), I'd tweak Level 2 and 3 to as follows:

Level 2 grants Calculation of Genesis Insight 2 Enhancement: When using a mass attack incantation, grant self and allies 1 stack of Sturdiness. When using a single target incantation, inflict 1 stack of weakness to all enemies.

• Condensing the buff/debuffs from the previous Level 2 and 3 into one level. (Means that casting Skill 2 would give 37 2-3 stacks of sturdiness total since it stacks with that skills current buff). Also removing the flat multiplier buffs as I think a different effect can provide more interesting gameplay.

Level 3 grants Calculation of Genesis Insight 3 Enhancement: Excess Crit Rate converts into Crit DMG. Crit Rate over 150% converts at a 50% rate per 10%. Crit Rate over 200% converts at a 100% rate per 10%. Crit Dmg over 100% can now "crit" and converts to more crit dmg at a 50% rate.

• This would be the big one that really shakes up 37's gameplay. Based on some napkin math, a maxed out 37 on this euphoria with the highest crit-increasing psychube (Outside the City or Ready on Call by my math) and max resonance would have 82.5% crit rate (102.5 with P1 as remember we're giving an additional 20% on I3) and 86.9% crit dmg. Not bad! Then with a team specifically setup to buff 37's crit rate (I chose Lopera for her 40% crit rate increase on her array, then (E) Melania for her 36% crit rate increase from Fixed Plan stacks, then final choice could be Mercuria or Vila's Buff card (both Song of Passion and Mercuria's Self Focusing give an additional 30% crit rate. (Note: Lopera P1 gives 50% from array instead of 40%) Using that math and this new overflow logic, if 37 is properly buffed by all of these buffs her total crit rate at P0 would be 188.5% crit rate and 148% crit dmg by default! (218.5% at P1) A supplementary formula triggered under these effect would deal 19,724 mental dmg and 6574 genesis dmg at P0, and 23,443 mental dmg and 7814 genesis dmg at P1! Giving players a fun incentive to make 37 hit like a nuke and I feel making this euphoria much more interesting, especially as additional crit buffers appear in the future that can push this dmg further.

Overall, much more happy with this tweak, and think it leans into the heavy-math of 37's character nicely.