I set my occupation policy to martial law until I was able to get the reconciliation policy and only lost about 6,000 total manpower before I cored the states. If you insist on putting those states on civilian administration, then that's your fault for choosing a poor policy that makes no sense in the face of armed, determined resistance.
Martial law isn't enough to fully suppress them without quality garrisons. And doubly so for reconciliation. I just did a quick test. Set the region to martial law and waited 4 months, too soon to actually fully equip your garrisons. -10K casualties to resistance. Literally did nothing but set it to martial law.
The only thing I can think you did is you disbanded a good chunk of your army. Turkey is gimped either way. And even though this does impact resistance, it only lowers the cap to around 25%-35% which still plenty to continue draining a good chunk of your manpower.
So the first half of the game you are stuck wasn't manpower, equipment, and massive amounts of PP on decisions and garrison templates. This update was nothing but a nerf for Turkey.
And this is just
one complaint, and arguably, a minor one. The current state of Turkey after this DLC is pretty abysmal. Boring, weak, stunned.