I sent and received. You want your BTC wallet to be empty, leaving your BCH there. 
If you import your private keys into a new wallet, you will import both BTC and BCH, and you will be back where you started!

Wait until the transaction is confirmed, before restoring from seed in Electron Cash. Apparently you need to select the correct server to get access to your BCH in Electron Cash.

Good luck and maybe start with a small amount, don't risk too much or trust anything too much!