Congrats on the 1 month tobacco free!!! I believe the blu are a kr808 and the ego is a 510 connection so I don't think they will go together without a 808-510 connector. (I've been known to be wrong before so take anything I say with a grain of salt)
If I understand your question correctly --you're worried about having too much nic? Adding 16mg to 24 will actually drop the nic level (not add to it). So if you want to mix flavors, have at it and have some fun.