We understand some of this, but you really need to look at the core issue here rather than band-aiding things.
The problem I'm seeing is that you're killing personal merit gain for the sake of powerplay balance, which we understand. But, you'll never find a happy medium there and should probably look into disconnecting those things in some way. Like, there are things that help the faction as a whole that may not help an individual system. Exo being a good example. Why kill personal merits when you could just change the merit rate for the power based on the activity?
As a semi casual player, even the first module unlock seems unattainable for an adult that works full time. So all of these players with super overpowered modules are lightyears ahead of players who never had access to these due to being new. That is a balance issue. Ideally, you should have created new types of modules for powerplay 2.0 and put the old powerplay modules as standard faction unlocks, or make the first unlocks easier to obtain (like a boost in merit personal gain to your first faction or something).
The powerplay balance is important, but as other have noted, fighting back undermining is now out of balance.
Edit: Stronghold fighter undermining is now in a better spot. They reduced the merit gain, RATHER THAN JUST TURNING IT OFF COMPLETELY. And for the record, it's not an exploit if the devs made something a certain way. The data thing is definitely an exploit, we get that, but you can't say anyone did anything wrong with rares and escape pods. Escape pods are Aislings main thing.. now you get nothing except a miniscule weekly reward that isn't even worth doing.