So give them an incredibly durable conditioning, and then subject them to stressors on that conditioning for a century or two. Then vet the resultant personality.
Anything stronger than the current level for the Forge Scholars would turn them into imperial servitors in pretty much every aspect but name. You
might be able to get away with that for Scholars of Creation, but they are the only Scholar that
could have their conditioning altered without causing massive problems for Exatari society. Scholars have been made for well over 100,000 years at this point and the Living Mausoleums have done countless optimization experiments on the process in that time.
At the moment, the Scholars are insanely fine-tuned for their purpose. Balancing durability against the flexibility that they require to do what they are meant to do. The conditioning
could be made stronger, but Scholars are
rare. There are only 10 billion Exatari in total in the galaxy, one in a thousand might be able to become a War Scholar, one in a million might be able to become a Forge Scholar after 20 attempts. Any more durable conditioning wouldn't allow the
recovery of broken Scholars, they would just shatter, the overlay and their natural personality just annihilating each other in the moment of a break.
The Living Mausoleums could prevent Breaking from being a chance, but to do so would mean that if one did break then there would be nothing to recover and it would also cripple the purpose of the Scholar in the first place. So the risk of Breaking is carefully balanced against the ability to
recover a Broken Scholar and remake them into a Scholar.
In short, any stronger Scholar mantle would result in automatons instead of thinking beings.
