"The Insidious I Star Destroyer is one of the most overpowered ships ever constructed by the empire, thankfully only 15 were ever built, they cost about as much as 5 Imperial II star destroyers with full crew, its shielding alone keeps it from any real harm, its turbolasers are much weaker individually but can easily overpower shields with sheer number of bolts flying at the enemy."
Point nose first at target for best damage
one of the reasons star destroyers are wedge shaped is so they can focus all of their firepower on one target, which means this ship is more lore friendly than quite a few ISD's I've seen (and made).