Explain this to me: I open with Snipe from stealth and kill a burrower. Chance to hit: 95%. I end my turn without moving, so I'm still Focused
It was the first turn, meaning there was no enemies next to you and you didn't suffer the close range penalty.
I take a couple hits from Spawn, and one of poison ranged attacks hits me. Next turn: my chance to hit another burrower at the same range is now ... 32% ??
If you took a few hits from the spawn, that means the spawn is next to you.
That in turn makes you suffer the close range penalty, which is 40% for all sniper rifles except Spearhead, Dragunov and those with a barrel refractor mod.
Also, while this is never said anywhere in the game, I found out that you lose any precision bonuses from mods if you suffer the close range or move penalites, so you don't get 10% from standard scope and/or 10% from bipod.
Were you using a Corsair/Harbinger/Reaper sniper rifle with scope and bipod? Because if that is the case, it makes sense more or less: 95- 40(close range penalty) - 10(no bonus from the bipod)- 10(no bonus from the scope) = 35. The remaining 3% were most likely due to lighting or some evasion shenanigans since no one really knows how it works exactly and sometimes it does some really weird rounding that can shift the result by a few %.