Explain drop rarity?

[Rodeojones1979]

Good morning, team,

Can someone explain to me how to interpret the drop rarity as seen on the p99 Wiki? Take Sentient Armor for example. Under A Suit of Sentient Armor, each peice is listed as:

(Rare) [1] 1x 75% (8%)

I interpreted this as any one of the armor peices drops 8% of the time. But I spent a couple hours trying to farm them last night and didn't see a single one drop. It felt silly! I certainly could have bought a whole set from the takings of just plat farming elsewhere.

Can someone explain this for me? Thanks!