Its not your rifle.
With the 17hmr, CCI and Winchester are the only ones who manufacture the ammo. Hornady, CCI, Federal, Norma are all CCI. The problem is there is ZERO consistency as CCI simply doesn't give a shit anymore. Winchester is even worse. They literally will use one type of powder one day and another type the next day for the same brand of ammo. On top of that, there could 200-300fps difference in the same box of ammo.
15 years ago on a calm day with high magnification you could shoot 3 shots into 1 hole at 50 yards and 100 yards would average 3/4" or less. Today, your 1 3/4" doesn't surprise me and is frankly a little better than average.
They say the different brands request certain specifics from cci. They may demand better quality control, but I think that is only in theory.
My suggestion would be to buy a box each of cci, Hornady, and Federal. Forget Winchester and browning as they are even worse. If one of the boxes shoots for the most part 1", run back to the store and buy 10 boxes of the same lot number. From there, you will have to weigh each individual round and create batches. It's the only way now unfortunately
Honestly, I think you are better off buying a 17 or 22 cal centerfire in a light compact platform. You have options from plinking ammo to match grade. If you are small game hunting, you will have to find someone who can load them down to rimfire magnum velocities. Reloads of Dallas or the likes.
Good luck, it sucks my friend