TLS config check

[SW]

  According to https://cipherli.st/
> ssl = yes
> ssl_cert = </etc/dovecot.cert
> ssl_key = </etc/dovecot.key
> ssl_protocols = !SSLv2 !SSLv3
> ssl_cipher_list = AES128+EECDH:AES128+EDH
> ssl_prefer_server_ciphers = yes # >Dovecot 2.2.6
> Is what you want.

Ok, so I have changed my ssl_cipher_list to: ssl_cipher_list = 
AES128+EECDH:AES128+EDH

Before I made this change clients were connecting with the following 
cipher in the log file:

ECDHE-ECDSA-AES256-SHA (256/256 bits)

After the change the log now says:

ECDHE-ECDSA-AES128-GCM-SHA256 (128/128 bits)

Is this an improvement (or more secure) despite going from 256bits to 
128bits?

Thanks!