User blog comment:SlashZero/2016 Spring E-7 Central Princess (Damaged) WG42 Bonus Investigation/@comment-1421453-20160521185017/@comment-861160-20160522170429

Well I've encountered a nearly 2.0 2WG42 bonus from chuuha Ooyodo, so I'm not sure. I don't think we can discard tank upgrades having significant effects though.