From C_Player entity:
m_shieldHealth(int at offset0x170): Current shield points (0-125).m_shieldHealthMax(int at offset0x174): Max shield tier (50=White, 75=Blue, 100=Purple, 125=Red).m_helmetType(int at offset0x4600): Helmet tier reduction multiplier.
Draw dynamic armor icon with shield health bar on your overlay to know exactly which enemy has Red Evo armor before pushing fights.