How to make best use of Triglav Protector in HotS

I’m looking for details about how to best use the Triglav protector, as both the pilot and the gunner. The wiki lacks damage numbers on the gunner abilities, and in the middle of a game I’m too busy fighting to look closely at the numbers; so that makes it rather hard to figure out the optimal rotation for the gunner.

When should it be used to target heroes vs buildings, should I charge the same structure or move between structures when shield is on cool down. what combinations of abilities for the gunner has best dps for either buildings or vs players? Basically how do I make sure I’m not wasting the protector if I hop in to pilot it?