Some suggestions as to some Kurdish principalities to the east, at this time likely vassals to the Sutayids:
View attachment 1151454
Though this is describing the political situation in 1390, it is likely that at least when it comes to this small detail, it had no changed much since 1337 (the Sutayids had diminished by then, but no power had really taken their place).
For context, a map of the situation in 1390, which is accurate regarding the more sedentary groups but inaccurate in terms of the holdings of the Aq Qoyunlu and the locations of the Qara Qoyunlu, Dulkadir, and Döger:
View attachment 1151460
I am curious though... how do you plan on representing the Aq Qoyunlu and Qara Qoyunlu, given that they shouldn't hold any land on the map in 1337 (though still exist)?