Once I was stolen 80 EOS c MEW wallet. I participated in one of the rounds of EOS ICO, got tokens, but did not send to the stock exchange, after 5 hours they were stolen. I was very sed. But then I realized: if it were not heppends, I would transfer all my eos to this adress before starting the EOS main network, and then there would really be a disaster. Here is a lesson, it cost me 80t EOS, but well that ended so could be worse.
So before sending the entire EOS with one transaction, send only 10% of stake. Then waiting about 5 hours and only if everything is okay to send the rest.
I hope everything will be OK