For the past 2 weeks-ish, I've been running nothing but T3 Iso Vault bounties, and I've noticed that the drop rates on the Wiki don't reflect what I've gotten in 120+ runs, as shown here:
I've seen a bunch of other people saying they were drowning in Casings and Weapon Pods too, but me and 5 other people would only be anecdotal. However, there's a much bigger sample pool to draw from, and that's Warframe Market. See, if you go there, you'll see there's a supply of Casings and Weapon Pods that's just as disproportionate as what you've seen above. They go for a single plat, whereas the Engines and Pods go for 7-10. I can't see this as purely coincidental and think the abundance of the former 2 parts and the relative scarcity of the latter 2 reflect the lopsided drop rates.
For further anecdotal evidence, I contacted 8 traders to confirm if they were seeing results like I am, and they said they were. What's more, I spent about a half a day scouring trade chat to see if anyone wanted to trade Casings/Weapon Pods for Engines/Pods. Not a single person wanted to. It was either Casings for Weapon Pods (or vise-versa) or Engines for Pods (or vise-versa).
If you looked at the wiki, you'd think they'd be equal trades, but the real world just doesn't point to that being the case.
So.
Has anyone else done copious amounts of Iso Vault runs? What were your results? And can anyone explain the disparity I'm experiencing as well as the stock and value disparities existing in the markets to reconcile the supposedly equal drop rates between these parts?