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Getting the right tension on the right hand side nut is critical. The little nut has positions it drops into at 180 degrees as you tighten or loosen it. Between these positions it exerts added force and tightness as the point hasn't dropped into the groove. You have to carefully turn it in our out and feel for the notch to get consisten pressure.
The sights are actually far simpler than it looks. Loosen the screw, adjust and re-tighten.
"...Springfield USGI sight..." Same thing. You can replace the whole sight with an issue sight if you want to go to the expense.