Jig/Hook Question

[joatmon]

I noticed on a recent ice trip, that one of my jigs often didn't result in a secure hook up, and I eventually traded it for another kind.  It could have been operator error, but wondering about hook angle compared to the jig head and eye location/orientation and overall balance and how those affect hook set when jigged vertically.  That particular jig seemed to be similar to the other one that was working better, so not sure why.

Anybody have some thoughts or experience?