Mike, It sounds like you are off to a good start. Handloading will help a lot, especially if you get the bullet off the lands about .025" or even .030" as mentioned above. Find a good load and then play with the jump till you find the sweet spot.
You may want to do a more thorough job of barrel breakin. Your breakin procedure just won' t do the job on a factory barrel. Clean to bare metal, remove all powder and copper fouling, between each shot. You' ll know when it is broken in when it starts cleaning up very quickly. That' s because all of the tiny metal burrs have been shot away and no longer are there to catch the copper. Once broken in, the barrel will shoot cleaner and clean up much quicker.