Is there a specific reason why you haven't added a scope glint to the Kraber yet?
Getting knocked by a Kraber out of nowhere can ruin a team's entire game, and it still happens even after the damage nerf. Adding a scope glint when ADSing the Kraber seems like most simple and effective way to balance it.
I didn't see others have already answered this for me while I was crafting my response, but I'll reply anyway!
I think adding glint would hurt the identity and power fantasy quite a bit. Lurking from afar and patiently waiting for the right moment for that first shot is unlike anything else in Apex. Once that's been fired, the cat's out of the bag. I think the Skirmisher perk added some counterplay here as well. Pinging a looted Kraber already has the squad on high alert, but the thrill/panic of that uncertainty is palpable.