The Hitbox on the dozer blades is narrower than the tracks of the vehicles. This causes them to unintentionally roll over things that they should be scooping up. See pictures 1 and 2. The scoop will miss but the wheels won't.

Yeah this will be a hard nut to crack.
Bounding boxes in MC are Square in shape not rectangular so if i want the bounding box to be that long then it needs to be this long too.

I may be able to bump it in a little bit to make it slightly smaller so its less likely to run up the sides of something the blade missed.

What about a few really small square hitboxes at the 4 corners of the blades and going up the sides?

good idea but it wouldn't help the problem is because the buldozer breaks a 5 block wide path but its about 5 blocks wide.. .making it hard to keep inside the path it cuts..

I often place the blade down and back up when digging down.
Something i've seen some real drivers do before.

Thought of something else. Minecraft keeps track of which direction models/ entities are facing, so maybe an if statement that increases the path width to 6 when the dozer is travelling diagonally

models & hitboxes changed in newest release.
There will still be cases where they do not align exactly due to issues noted above but most are now easier to drive.