Increase the dupe bonus upgrade, so it doesn't take a shit ton of dupes now. Though this worries me:

The new Duplicate Exp bonus feature from last week needed a few tweaks because of imbalances. It was unintended for people to be grinding thousands of Renault FTs to grind up into exp fodder. Plus, the way the instant exp bonus was applied, it didn’t make sense for people to immediately consume the duplicates because later levels always garnered more exp. And at just 1% Boost to exp gain, it didn’t feel good at all to use 5-stars in Upgrading. The new changes will now increase the effect of the Boost based on tier, and caps out at 30% now. And if that’s still not enough, next week you will be able make use of those Boost stacks in the next level of the feature: Elite status! Elite status will provide some pretty steep stat bonuses, so it’s worth it!
This new upcoming 'elite status' or something... seems might be the turning point where we start seeing paying players kick off even dedicated free players off the leaderboards. Hopefully it's not the case. Though free players can still grab dupes of 4stars fairly easily off of the factory via research.