I have given to the Cryptarch like 20 Legendary Engrams, and as for now, I only have succeed in obtain only one legendary item. 1 in 20!!!
Really, this doesnt work, it turns meaningless the farming.
If you don't want to be very easy for the players to obtain legendary loot, ok, it's fine. Reduce the drop rates, but make sure that each time we got a legendary engram, it's a legendary item what we are going to obtain from the Cryptarch
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Level up your cryparch level. Farm glimmer to buy your ranks. Also, I made an alt, and any engrams he finds I store, so my main can use them and have a better chance of getting rare loot.