Sadly i'm having the same problems too.
But mine i only able to send less then 100,000 per-transaction to Novaexchange, and sadly everytime i send my limit getting smaller and smaller...at this rate this will take me several days or several weeks for me to transfer all my ESP1 to Novaexchange.
i really hope the admin can help us to solve this problems.
So we can send/transfer all our ESP1 to Novaexchange in just one go, without doing this over and over again...because this can took several weeks to finished
the old wallet has two limits: max 3M transaction size and max 160 input. do you have dust transactions?