Which counties/dychies should I revoke for my persona demesne? From within the HRE 1066 start? ... I became emperor in 10 years.

First time playing in 18 months, I started in Sardinia, Holy warred that Duchy, switched to Catholic and bethroed my kid to Matildas. She helped me snipe Corsica, and the pope gave me some war funds that I used to form Sardinian Kingdom.

Swore fealty to the HRE, joined a feast IMMEDIATELY and there was an event where I could choose my intent ( checked HRE voing and i was on 4 with LOADS of others all locked on 3 ) immediatedly decide to put the kabosh on the Emperor, and I succeed. HRE by 1076 lol.

I have open demesne slots and lots of allies to make (betrothals)+ Lotsa criminals amongst my dukes. Which counties/duchies are profitable/good for me to revoke/steal?