About your theory,
In order for a IP to be "black listed" I have noticed in my opinion it is very very rare unless it is a high amount of bans.
Example:
Ip 1: Casually makes 10-15 tuts accounts throughout a day, all get banned within 3 days as they later get used to farm
Ip 2: Makes tut accounts 24/7, It took about 120+ bans before I noticed changed in the amount of creation bans.
As far as the deep freeze,
I havn't done this via the tut testing, but my own system (My automatic F2p farm) it works perfect