That's a bummer.
I would also be incredibly frustrated if I put that much energy into reloading, but couldn't get adequate results. So I totally understand where you are coming from. You are using all good components. Personally I had an issue with my Redding FL die and 6.5 Creedmoor, for some reason I could never get a consistent shoulder bump from it. Replacing it with a Whidden die solved that problem. But if I was in your shoes, I would be really hesitant to continue to pour money into reloading to continue to have issues.
For factory, I would look at brands like FGMM, Blackhills, and Berger. Hornady is decent too, but I've always had pretty high ES/SD's from it. You may be able to send your brass to a company like
@CopperCreekAmmo or
@Rio Precision Gunworks, and they may be able to develop good ammo for you with brass you've already purchased.
Personally I wouldn't spend money on a tuner, there's a bit of snake oil there. Sometimes hanging a weight off your barrel will help - but a suppressor will do the same thing. Just don't think that moving a small weight a few thousandths of an inch will make any real dramatic impact on your precision and unlock some sort of magical precision node.