Hey fellas my son 14 has a 2013 grizzly 350 with stock rims and tires. The quad is kinda unstable in turns tires are kind of mushy with the proper air in them. Any ideas on a way to make this thing more stabile with tires and rims or anything else for that matter. Taking him to Hatfield-McCoy in October and would like to make this thing better handling. Thanks in advanced.