Actually, that's not a reason at all. +30 still means that one can arrive at a value of about 45 if you're starting with a 30 intelligence. So... are basic Hive-worlders who can fix a nuclear reactor half the time better than basic Hive-worlders who can fix it 3/4 of the time?
Also, I'm really wondering how you intend to arrive at that +60, considering the test likely starts at somewhere around -30 and certain tools only work for those with a trained skill. You'd have to rack up 90 points of bonuses to get there, which doesn't sound that likely to me.

That aside, while characters can potentially get easier Dodges in Black Crusade, they get fewer of them - Step Aside confers an extra reaction that can be used to Dodge or Parry (as they're both the same action, Evasion), but Wall of Steel no longer exists, so characters can't get more than two opportunities to dodge each turn. And, quite frankly, once you've gotten to Dodge +20, it's more about the number of Dodges than how easy they are anyway...

Because the maximum penalty is -30 and the maximum bonus is +30, said Hive-worlder's chance is going to be a maximum of 15%, not 45%.