Why did you use the corn head grease if you fixed the seals? The proper oil is the 90 wt oil used int transmission and hydraulics. I think the grease will possibly separate from the bearings and that will not be good. The bearings should immersed in oil at all times.
If you got the "timing" off when you assembled the sector gears, it probably will show up when you turn the wheels from side to side and find they ae not symmetrical movements.