Best assessment made here. I 100% agree with your time for rucks and forwards rotating.The way i look at it Soldo did nothing wrong and looks like he is really starting to break through in the ruck and should not be dropped so that leaves the question of who is 2nd ruck.
Balta did not have a good game and should be dropped which leaves Chol & Nank
Watched the VFL final 2 times and until 3 quarter time i had Chol in before Nank but Nanks last quarter got him over the line for me so it should be a Nank/Soldo combination.
Soldo 70% Ruck
Nank 30% Ruck + 30% Fwd
Lynch/Jack will be rested 15% each which provides the option to play nank 30% fwd whilst not pushing Nank too far