I used to set the skew at 45deg H before installing the feed horn assembly just to make sure it was set before installing onto the dish. Then I would peak the signal on a horizontal TP on my southermost satellite by rotating the feedhorn in the scaler VERY slightly CW or CCW only a few degrees at the most, maybe 2-5 degrees. Then I connected the cable to the motor and checked again, usually good then on the vertical TPs. When the dish is moved the skew should line up unless the satellite is off a bit, without moving the skew other than V/H.
I liked the corotor design, but had to move to dual LNBFs since I am running several receivers now. Suprisingly I had little trouble with them over the years, and the trouble I did have was mostly due to lightning surges etc. Don't think I had one fail due to cold (gets to -40 here).