Like you,I never change something I already know works.
Apart from some experimenting with different broadheads,and up grading arrows as newer an better types come on the market,,,I still shoot 99% Old Bear Razors and heavy arrows for everything.
The Bears have been my standard for 40 years,The same alloys for 20 years,then changed to GoldTips for around 15 years,resently switched to Carbon express,but still shoot Bear Razorheads for most of my hunting.
If I was hunting Rabbits today but Feral Cattle tomorrow,I'd change nothing.