Power Steering Power Down Mod

i just did the Saginaw pump mod by adding washers in the regulator. Mine had about 0.08 in of washers in it already, so it looks like someone had already tried it. I bought the kit on Amazon. I added two more 0.20 in washers for a total of about 0.120. It made some difference, but not as much as I expected. Would like to tune it down some more. I read somewhere that 0.125 (1/8) was the maximum. Don’t know if that is true. Anybody have some experience with this?

Don’t have a pressure gauge & don’t really want to buy one for a one time use.