Hi unajet
I fully agree with Steve, that no bondage should cause pins and needles and especially not loss of feeling.
Question is why you experience this. I assume you do have a partner putting this device on you? You may play around with just holding the arms in the same position - try to estimate what causes the problems. One reason could be lacking flexibility - which can be trained by slowly pushing the arms in the right position letting you relax while it's done. You might feel a strain and then at some point a relief - that's when the actual muscle-stretching happens.
Another problem could be that you turn your arms in some bad way - hence causing nerves to get pressed. This could again be caused by too tight muscles as you try to gain the desired position even if you're not fully ready.
One way to do stretching is simply to hold out an arm and walk through a door - let the door force your arm towards the back. This should stretch the muscles passing under your breasts. Do the exercise holding the arm in different heights.
As Steve suggested be aware and respectful to your body! Make sure you don't push yourself into some unsafe position just because you saw pictures which are indeed very sexy.
Did you ever have your partner tie your hands round a pole? Do have a look at
https://www.kink.com/shoot/33313?aff=vicsuh to see what I mean - the pole can have different sizes (a nice walk in a wood....) to let you experience the bondage without straining the arms too much. And if you're using cuffs it's even easier (and faster to release).
Good luck