The faucet is 50 years old. I doubt it had a low flow aerator originally.Needs a lower flow aerator or one which mixes in more air. I like the spring-flo aerators from WB. #51028 and #51027.
The listing for the #51027 shows a female but is labeled as dual thread. The title is wrong, the #51027 is female threads only. They messed up when they launched the new site. If they say out of stock just order anyway, you'll get them in a couple weeks regardless.
But sure, restricting the outlet will make it mix.