As it stands right now the main viable loadouts feel to offense focussed. To me there seem to be a few main culprits in the form of the most common additions to any tank loadout.
Skills: Rapid Loading, Steady Aim, BIA, Run and Gun, Snapshot, and Sixth Sense I believe all provide to much of a benefit. These skills are so strong that I run them on every build in WW2 and as a result my tank's gun is usually able to easily snipe weakspots as well as destroy an enemy tank faster. I will propose a solution in the final section.
Equipment: Advanced Loader and Camo Net also provide to much of a benefit. Advanced loader much like rapid loading provides a massive dpm boost contributing to faster time to kill. Camo net allows some tanks like TDs to be able to take unconventional positions (IE Taran in the open unspotted at 250m).
Proposed Solution: Remove Advanced Loader, Rapid Loading, Steady Aim, and BIA. These perks offer an undeniable advantage over those without the skills equipped as well as contribute massively to faster TTK. Reduce the effect of Run and Gun as well as Snapshot slightly to encourage spending more time aiming and reduce the consistency of auto-lock. Sixth Sense is incredibly powerful but also an established mechanic, I would suggest making this a default mechanic separate from commander skills. Camo Net could simply be reverted to have a cool down after movement before activating, this would make positioning more of a crucial skill to camo builds.
Intended Effect: The goal of these suggestions is to reduce the speed at which matches play out by lengthening the time to kill, decreasing accuracy consistency for auto-lock and on the move shots, and lowering the tank stat gap between fully equipped and bare bones tanks. Hopefully these changes would open up more options for niche skills/equipment that better reflect a player's preferred playstyle.