Amtal
Regular
Reg. better control/flexibility of assigning fiefs, I suggest you look at Leonion's Tweaks ( mentioned by clock4orange before in another regard ) . #3 and #13.1 specifically .
Also, reg. getting Lords of other Realms to join you : When you took Hrolfsson Castle, you captured at least 2 martial Lords who had something around high 30/low40ish relations with you - iirc . Instead of letting them go, you could have taken them prisoner . Relations suffer by 5 points from that ofc, but in most cases relations above 30 will still be plenty enough for them to offer their Oath of Fealty to you when talking to them about their freedom .
Also, reg. getting Lords of other Realms to join you : When you took Hrolfsson Castle, you captured at least 2 martial Lords who had something around high 30/low40ish relations with you - iirc . Instead of letting them go, you could have taken them prisoner . Relations suffer by 5 points from that ofc, but in most cases relations above 30 will still be plenty enough for them to offer their Oath of Fealty to you when talking to them about their freedom .