At least in regards to bounty materials, it's 1/2 torment level. So t8 drops 4, t10 drops 5. t9 and t7 however i think is 50/50 on dropping 4/5 or 3/4 respectively. Also that number is doubled if you do bonus act, so basically if you're only doing bonus act, you get the same number of materials (on average) as the torment level.
From my xp with ubers, t10 seems 50/50 on 2/3 organs but that's pure conjecture.
Maybe.. but I've done nine T7's and got 4 mats (or 8 with bonus act) EVERY time. I know its a small sample and I could have had a good streak but right now I'm convinced its 4 mats for anything over 6. I've only done one T9 and also got 4. I can one shot anything in T7 so right now it just makes more sense to farm T7.
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Playing Diablo since 97. I know nothing and having nothing good to say, I be a troll.
atm its seems T7-9 drops all the same cache mats. I haven't done a 10 yet but speed farming T7 seems the most efficient to getting cache mats.