This is very common for all mediums at various stages and the only real way to get past it is to TRUST completely. The logic voice is part of your ego and it's up to you to use the larger part of your mind to quieten it.
Wanting to go back and communicate while in your body is another factor of ego -and nosiness!

The key thing is to keep the flow going, so you could ask your spirit friends to give you a mental 'nudge' or diversion when you are close to snapping the connection. Mine tend to occupy my mind with various images until the larger 'me' recognises what's going on and gently pushes that part aside. Try to think of the process like a dance of energy - sometimes you are leading, sometimes the spirits are leading, but it all flows effortlessly and simply.