how when hacking a ship near my rank equipped with only 1 AI super computer and 1 gaamma channeler and I with 400 scan and 600 cloak and it Fails and counter hacks ?

There is always a chance of not making it. Hacking has that small chance like invading a planet that it will not work.

sometimes when you roll a 20-sided die, it'll come up as a 1... in pen and paper roleplaying games this is usually an auto-fail, regardless of how high your skill level is for a particular roll...

.....same concept here, no matter how high your cloaking..... can't say for sure if it's a 5% failure here though... might be 10% failure, similar to planet invasions