Well, I checked what I could and identified what's what within this context, but in this few batches of exhaust rockers I had to work with
I never found anything worse than 1.49 or better than 1.56.

I haven't worked with a whole bunch of these for my whole life or anything, and have only done
whatever it is I have done, and found what I found.

In my humble opinion...as stated earlier, I really feel they would break before losing ratio over time.

I would have to guess that the folks who rework old rockers and change the ratio....most likely accomplish that by relocating the adjuster.