Changing the pressure is not the way to go about it. If you want to change the feel of the box to make it less twitchy, the correct way is to replace the "spool valve" in the steering box with one from a mid-'80s TA or something like it. I don't have much experience with those, but once test-drove an '87 that really impressed me by how much it felt like rack and pinion.
Of course, changing the spool valve requires complete disassembly of the entire box, so you may as well go all the way and get a quick-ratio rebuild...
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