Firstly, congratulations on your great job so far.
Secondly I would like to point out a few things I have noticed in almost all of the modes.
1) The Bulgarian Empire emerging in 1185 was basically more Romanian than Bulgarian at first. Asan, his brother John, then John Kaloianos and Borila Asan were both Wallachian and Bulgarian, they drew their strength equally from the north and south of the Danube. It was not until John II Asan(1218-1241) that it became a more Bulgarian state, the capital being Tarnovo. So it should spawn as a rebellion on both sides of the Danube against the Byzantines.
2) If it reemerges as Walachia, it should reemerge only north of the Danube, since Basarab I, forger of the Wallachian Voyvodat was a rebel against Hungary and not the Byzantines. You should also take notice that the rivers running north of the Danube are much larger than those south, and thus should be represented accordingly: Mures, Tisa, Olt, Prut, Siret.
3) There is always something wrong with the cities based in nowadays Romania. Those in Transylvania shoul have their Hungarian names, since they were founded or rulled by the Hungarian Crown, or German colonists. So Satu Mare should be Szatmar, Sibiu Hermanstadt and so on. In the 11-12th centuries the regions east and south of the Carpatian mountains were not densely populated, and their cities emerged much later(14th-15th century), firstly in the immediate vicinity of the Carpatians. SO in Wallachia you should have Campulung, Curtea de Arges, Poenari, Targoviste, and in Moldova Suceava, Baia, Campulung(another one). Also, Transylvania was one of the most densely populated regions at the time, so place a large amount of rural population to represent this accordingly. In Moldova and Wallachia, the population was rather scarce.
4) Transylvania was not fully controlled by Hungary in the 11th century. In fact, it was so hard to control that Hungarian kings always named a Voyvod(not duke!) to rule it for them. It was not until the 14th century that Hungary controlled Transylvania effectively, and still they named a voyvod as their enforcer. Represent this thouroughly, I think this should be a region capable of rebelling, and very hard to control and centralise.
5) The Carpatians were a very hard obstacle, impeding the progress of any army. This is hugely important, as it should shield the Hungarian - controlled Transylvania to fend against attacks from the east and south.
6) There are 2 extremely important cities you must represent: Chilia and Cetatea Alba(meaning White Castle in Romanian, also called Moncastro by the Genoese and Asprokastron by the Byzantines). It was a very important commercial point on the route that tied Constaninople to the Baltic Sea. And so was Chilia, they were hugely important economically and strategically until the 17th century.
Those were my thoughts. Take notice of them if you like and keep up the good work. Cheers!