I was just going to go to JD to buy some medium lift blades to see if I could get my mower to mow better. It is a JD 345 with a 54" deck and the mower itself is good but the deck is junk. It will run over and skip more than any deck I have ever seen. I have to mow twice to get it to look right and I sharpen blades about every third mowing and clean deck out. Do you think these would help me?