"Should I start chasing/changing my loads trying to tighten up things or should I stay with what I'd like to think of as my first "pet load"?"
If you are an inveterate gun tinkerer, as many of us are, there is always the temptation to try 'just one more thing' to tune a rifle. IME, the hardest thing for a gun tinkerer to learn is when to quit messing with things.
You have a hunting rifle that is zeroed where you want it, shooting good groups with the first shot from a clean dry bore going very close to the shots from a fouled bore.....
STEP AWAY FROM THE RIFLE
You have your hunting rifle set up perfectly- now is the time to quit messing with it.