Wilsons Sandbox

I got my new Kenda's 760 front and 270 rear.. I like them in the dirt they realy roost.. BUT the grooves on our So- Cal freeways toss me around.. My rear tire seems to lock up a lot quicker also.. anyone else have this hapen to them? is it to be expected? I am just using my front brake more now.. I can deal with that tho.. We'll see how long they last. But what do you expect for $96 front and rear tire and they mounted them too.. Dale Johnson Y2K KLR with 14400 miles