128 bit encryption for citrix connections

We'd like to up the TLS encryption key size to 256 from 128 for our citrix connections. I'm assuming a change needs to be made to the client SSL profile, specifically the cipher, which is currently set to DEFAULT. I understand this setting to be defined as COMPAT+HW:@SPEED, the speed option possibly telling the client to use aes 128 instead of 256 for faster speeds (I am not entirely familiar with the string definitions here). Is this as simple as separating preferences by a colon, and then !sslv2? How to force 256 bit?

-GR