I do this too. Slow is practically useless unless you are only going a couple of feet. I think there needs to be something in between hunt and slow (crawling on the ground with your face in the dirt). Something stealthy that doesn't completely exhaust the men after a few feet. Slow should be renamed Crawl and a new Sneak movement should be added. It would be similar to what hunt is, but not as physically demanding as what slow is.
When you plot way points on a road you don't want to place one at every turn. Place them so they cut across turns and the vehicle will smoothly negotiate the turns. You definitely don't want to make right angle turns. If you need to make a sharp turn place one way point a little before the turn and a little after so that the sharp turn is broken down into two smoother turns.
Run a Panther or two up the field on the right and you will catch a few Shermans trying to flank you. Then pull up to the other side of the hedgerow and you will catch a bunch of reinforcements as they enter the map.
Famous line from a WWII movie (I think it was To Hell and Back), "How thick do you think this GI shirt is?" - the reply a soldier gave to a Sherman tanker who said his tank only had a few of inches of armor.