I have carpet grass and it really thick. My lawnmower's wheel's spin on the grass when I am cutting it. If I lift the back of the mower a little it will get more front wheel traction. Is there anything I can do to get my lawnmower to get more traction on the grass? Lawnmower is 9 years old, but wheels are almost new. It's been like this since I bought it basically. Thanks.