I see a problem.... if you got your first Life of the Dragoon at second 60 but you use B4B after second GCD.... you will have about sec 62 your LotD... and it will remain till maybe sec 92... so Only last nastrond will be covered by B4B.

If you delay a bit your LotD to about sec 70-75 you will can to use 2 nastronds with BFB + other oGCDs like Spineshatter again. Ok this will delay your second LotD... but at second LotD it will happen about 130 and will fit again with B4B and Dragon sight