Before live trading the Z strategies it is a good idea to thoroughly read these forums here. Several people were reporting wacky behavior of Z12 in live trading as well as backtest.

My personal observation is that all Z strategies except for Z9 more often than not are exhibiting close to random behavior which hardly can be called a "strategy". (The mods on this forum naturally will assure you of the opposite.)

Ultimately, you will have to form your own opinion, towards which, I see, you have made the first steps by posting your observations above.