I mainly think Turkish focus tree is slow but not very slow, decrease from 70 days to 35-50 in "some" options would make it perfect. I was following feedbacks whole week and tried myself. I guess inner politics might be shorter comparing to outer politics (getting along with majors)
Turkey gains some claims too late, I mean cores might be late it is okay, but when claims are late, you lost involvement in some regions.
I mainly think military branch of tree should definitely have shorter times (35 instead of 70), you need years to complete it and points, its hard to do as you also need to follow political branches.
I personally observed unimportant bug making Recep Peker leader and prime minister at the same time - it should be fixed.
People were generally annoyed by research options: Turkey starts with 3, and can only get 4th one (Ottomans stay at 3) while Mexico can get 5.
I think Turkey should get 4th research bit earlier if its possible, 5th research being late is not that important. If you think it would make Turkey too strong you might hide it behind Turan as it is already hard to complete.
There could be some other minor fixes/additions like construction of Anıtkabir decision I would really love to see in game, but all in all many internal issues in Turkey were well designed and represented, Kemalist ideology, 6 arrows - especially etatism, advisor lists are awesome, commander skills are on point, Kemalist-Traditionalist-Kurdish rebel tensions are fun to deal with.
Turkish community enjoyed it a lot. Thanks for everything.