One solution is to buy a clutch rear derailleur and skip the chain guide all together with one of our wide/narrow tooth chainrings:http://wolftoothcomponents.com/Home_Page.html
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We have 100's of miles on them with no chain drops!
No chain guide is lighter than a 30g one;)
Here is what I came up with, it works! absolutely no chain drops after some very rocky trails, I'm sorry but I'm using probably you competitor's chainring
...so What is the weight for your 36T sram comp. model? this one from MRP is 89.5g (36T).