Not sure if my math is the correct formula but I used an uncharged 100% crash with no knockback and +70% seawater.
Unimbued: 155
127 no power
Steam (plasma): 145
119 no power
I get imbued base damage is 0.8653…
0.866732283464567 with no power
which is higher than (0.8 * 1.1 * 0.925) = 0.814