You just want the trichromes to get brittle, and break off.
If you freeze the leaf, then the whole leaf gets brittle, you get to much green in your Hash from your leaves breaking.
IMO- first batch don't mix it up much, let it soak for 20 minutes. run a second batch. mix it up more. That will be your lower grade hash.
Get a rope and hang your smaller mesh bags. let it drain on it's own.