Simulacrum boss drop rate T-T

i farm a lot of time but what i got
Assailum and Peridy

i'm just wonder this is real drop rate ?

Assailum 45%

Perfidy 24%

Melting Maelstrom 6.5%

Collapsing Horizon 10%

Strugglescream 6%

Megalomaniac (2 modifiers) 7.5%

Megalomaniac (3 modifiers) 1%

I thought this is real drop rate

Assailum 45%

Assailum 24%

Assailum 6.5%

Assailum 10%

Assailum 6%

Perfidy 7.5%

Perfidy 1%

lol