Try a D756 or the old D752. I hated that stocker on mine. I ran the 739 in the first few hare scrambles that I raced the year I bought my KDX200. I'm a 185lb B rider, so I had the forks and shock done by Pro-Action (great local shop for the PA crowd) soon after I bought the bike. The 739 sucked, it was great in the hardpack, but as soon as I hit mud, or wet hardpack, it would wash out without notice. It took one DNF (after washing out in a turn that followed a mud hole, breaking my clutch perch, while I was in 4th) before I switched front meats. I now run the D756 in normal conditions (for western PA) and the old D752s when it is sloppy. Dramatic difference. Also, I had similar feelings about the stock K695, I currently run straight D756s in the rear, and love em'. You should also check and adjust your tire pressure before each ride. I usualy run 13.5psi for normal cond. and around 10-12, depending on how wet it is.
Hope this helps, Best of luck,
-Nick