I focus mostly on the UA (unique abilities) of designs, and will do it here again.
The caste system bonus is not bad in se, but is too complex for this mod's scope. It is also hard to balance, as probably it might result in spamming one type of villager. You could do things like "you train shudras alongside your vaishyas. Shudras are less efective at gathering and have less hitpoints, and die after a certain time ?? due to poverty IDK ??". No idea how to throw in the kshatriyas into that.
Rice paddies sound more like a card option. Not necessarily, but it's minor.
Governor: that's probably a big no, as it removes uniqueness of the Anglophone culture, like the previous proposal. Also, reusing other culture's stuff isn't the best as design cf Romania, which will get reworked.
Unbalanced costs: that's a UA, but a minor one. Does suit with the paddies.
Besides your too complex villager system, you have mainly assigned small uniques. The unbalanced costs could be a unmentioned unique. I think this design might need something that makes the design more solid. You have clearly done a substantial amount of research, and it's one of the best designs I've seen in months. I advise to take a look at the other British Raj thread, as I remember it being quite solid too. EDIT: viewtopic.php?f=8&t=1267&hilit=raj
EDIT 2: don't stare yourself blind at it, or don't just copy everything. It's best to have a solid design of yourself.