I can't promise to what exend these things will be touched on for the update but I will keep them in mind for the version after if I don't get to them.In the next update, I'd suggest getting rid of Adelaide of Susa's duke-tier title (speaking of Adelaide, she always seems to have a harelip, but I can find no historical mention of it). Her title was Marchioness of Susa/Turin, not Duchess of Ivrea, same goes for her father. Add in the fact she only controls one county in the duchy and I don't think it's justified. I'd also maybe relocalise the Duchy of Montferrat (which didn't exist until the 16th century) into a marquisate/march to better fit the time period, and give it to the historical marquises. Either that or rename the county of Bosco back to Montferrat and make Chivasso the capital again, but keep Bosco as a barony (from what I can tell Bosco was a small separate march on the southern tip of the in-game province). I'd also make Saluzzo a marquisate and have it exist after 1125. Maybe separate the del Vasto family from the Aleramici, too?
For the history part, Im still adding and reworking the history in northernmost Italy(Lombardy and Veneto mainly atm) so there will be some movement in the general area for the update and next one aswell. About the marquisate titles you are onto something, and its crossed my mind aswell as I was making the setup. I've hold back on custom titles due technical worries in the past but it might be a possibility of reintroducing. Bosco it staying as is, it was on par with the Monferrat branch in importance for a good while of the game period and it wasn't small. Del Vasto definitely ought to be their own dynasty for sure.