According to the score your vastu compliance is 60%, which is 'Good'. However a home is supposed to have all four corners, but since the south east corner is missing in your plan, below are some remedies you can follow to overcome the ill effects of it:
1- Feng Shui - The ancient Chinese art and Science which deals with the spatial arrangement of house, often offers remedies to Vastu defects. If Vastu deals with house during its construction, Feng Shui comes into picture after that, during the interiors and aesthetics. Mirrors are the elements used to overcome Vastu defects caused due to corner cuts. Any missing corners can be rectified by this method. The mirror should be permanently fixed on the wall and at least 6 feet tall. Single mirror should be used to meet the length criteria. In your case, two mirrors can be placed on the south and the east walls of dining room as shown in the image below. The dark thick lines indicate the placement of mirrors
2- Vastu Pyramids - 4 Vastu Pyramids can be placed one in each corner of the house.