You are correct, you can't mix active and passive, its one or the other, pots included (EMG actives use 25k pots)
I looked up the ad copy on others to see what the stock controls were and I found this remark:
With the original EMG pickups, it has a very clinical sound, great for funk licks.
So I guess your perception is shared by others, as that comment seems pretty spin-doctored to sell it.
I guess the Maple body and fiber neck must have something to do with it.
I have that exact EMG setup in a guitar I made about 25 years ago and
absolutely love them.
It's Maple capped both front and back with a Mahogany core.
It is anything
but sterile and bland.
The SLV's are warm and round and sweet, and the 85 is fatback city.
At least in my application.
If it is indeed the Maple and fiber combo, I hope you find something suitable to manage it out w/o having to do multiple swaps.
If it is the guitar, be very careful about throwing money down an endless rabbithole time after time trying to rescue an unsalvagable situation.
Personally, I would, at this point, start Googling as much as I could on that model to see what others before you have found.
I would try to find as many user comments as are 'out there' to get a realistic summary of the situation.
Before you just go and shotgun the pickups and spend money going in the wrong direction.