In the posting you didn't say what charge level you were using. I'd suggest that you try loading 3rds starting at 48.0gr and advancing to 52gr in 1.0gr increments. If one or more show better accuracy, split the difference in 1/2 gr increment and see which is better.
FWIW; Most of my .30/06 loads with IMR4064 date to the '70's. I recently retried the load you are using trying to find a good load for a Savage M110LH. I found that maximum for this rifle with CURRENTLY PRODUCED COMPONENTS was at 50.0gr. Above that, I got stringing and wild flyers with a hard bolt lift and sticky extraction. I was using Winchester brass and Fed210 primers....... Another rifle I have in '06 will take the 52.0gr load suggested as maximum now, and it is MAXIMUM for that rifle. In the '70's I could go as high as 53.5gr with an Interarms MkX Mauser. That rifle has/had a much longer throat than most other recent mfg. '30/06 rifles I've tinkered with.
Other powders I suggest you try are Varget and Reloader15. My current powder of choice for the '06 and 150gr bullets is RL15. At similar charge weights it's faster and more accurate, in my rifles.
For 165gr and Heavier in the '06 I use either IMR4350 (for accuracy) or RL22 (for velocity with 180gr and heavier- IMR4350 is more accurate in every instance, IME).
I'd too, try another lot# of bullet, and also try some 150gr Sierra ProHunter flat-base. I've had some occasional lot#s of Hornady bullets give me problems. A quality control issue... Mostly related to the fact that Hornady insists on putting cannulures on their bullets. Also, try different seating depths... I've got a Remington M700 in .22-250 that insists on a Sierra bullet have .035" jump to lands (sub 1/2MOA !) and two Remington M7's (.260Rem, 7mm08Rem.) that insist on bullets seated to touch the lands for decent accuracy (the .260 will do sub-moa with bullets it "likes". Hornadys are NOT what it "likes", but rather Noslers, and Speers.......).