“chance on attack” doesn’t mean melee attacks or weapon hits, it means “anything” offensive you do towards enemies, cast spells, 0 dmg debuffs etc
aside from that, have you taken a look at other pet builds? I guarantee you they are worthwhile, strong or good potential, but it might take some browsing to get the hang on if raw wall headbutt practice isn’t your thing.
Maya, top20, Duskdeep, Thepowerofmediocrity, GSasylum and even Automator has all posted lots of pet builds, some with more or less instructions on how to get going.
and ofc our famous hybrid hero gargabolo