It is already great that you reach a point where you are doing OBE and you are lucid. You need to practice your dream control, try to keep the same feeling as if you are awake. Do not think how you move, try to move without thinking.
Another thing I noticed, If I will put my hands under my self when I go to sleep I might have similar problems moving. Like I am under water or I am extremely weak. Do not know if it is the case, but it might be

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