Typically the terms "Highest Velocity" And "Most Accurate" are not used in the same sentence.
Your goal should be consistent accuracy, withthe most consistent velocity between rounds using the same data.
Consistent velocities are a good sign that you are nearing the best accuracy you can expect from a certainround, or the gun it is being fired from. Why does it make a difference to you if it is traveling 20 FPS faster or slower than another set of load data? Are you trying to set a velocity record or something?
Lets look at it this way, you're shooting a revolver, you alreadyhave the ability to load more accurate rounds than youor the gun is capable of firing. Higher velocities mean nothing when it comes to accuracy. Especially if you plan to shoot the same round out of several different guns.
You need to load specifically to each and every gun, and use those loads in the specific guns you created them for if you want the utmost in accuracy.
My suggestion would be to back down on your loads to get better accuracy, save powder, and to quit putting your gun under all the extra stresses of these uber hot loads you have been making.
I custom load my ammo, but just for my rifles. I use fire-formed brass, yes I have achieved velocities that have spun the jacket off and watched a grey streak of dust from the bullet coming apart while it was going downrange before seeing any signs of over-pressuring. But what does that accomplish? Nothing but higher stresses on the gun and myself.
I found my best accuracy withloads at the lower end of the data,
For my pistols and revolver, I use load data that produces the best accuracy and function of the firearm. And I have also found that to be very near the starting load data.