After cutting about 13 logs I realized that my blade guides were the weak link in cutting straight boards as I kept getting blade drift when cutting through knots. So I decided to double the bearings to better support the blade. I also changed the bearing holder to a peice of aluminum. The aluminum is 8mm thick so it is nice and strong. I cut the aluminum with my table saw and put adjustment slots in them with my slot mortiser. I used an old router bit of course and slowed down the router to about 6000rpm.
Now it works great and cuts through knots without blade drift.