Your right side tires, front  and back, have to move freely through the last plow furrow created.  If your plow is 12" wide, producing a  12" wide furrow, but your rear tires are 15"+ wide, forget a consistent result.
(I speculate this is your problem.)
If your plow is 14" wide, producing a 14" wide furrow, but your rear tires are 15" wide, the weight of the ballasted right rear tire usually  will pack moist furrow soil sufficiently so the  plow can operate as designed.
A 16" wide plow will allow the  rear tires of any COMPACT tractor, including your MF 451, to move freely through the last furrow created.
INFORM US OF THE WIDTH OF  YOUR  PLOW AND THE WIDTH OF RIGHT REAR TIRE.
	
	
		
		
			
				
					
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