you arent supposed to conduct an invasion through a jumpgate that is covered by a battleship, a station and destroyer patrols. It makes no sense. Work around your problem rather than trying to get it changed.
And sure, a GB can cruise around a Kusari stationary bs. But he isnt going to win any fights like that, so whats the point in making that comparison? Its invalid, because you cant fire in cruise.
I already conceded the point that Kusari stationary battleships probably need their power upped. But really, who in their right minds would jump through a passageway (hole or gate) knowing that there was a battleship on the other side. You dont wanna get shot, then you should avoid it. Theres more to fighting than guns and brute force. the other ke factor is subterfuge, and i doubt the BAF will cover all the jump holes with Battleships...