Fluctuating temperatures while driving

Thanks for the feedback, guys.
I think I will take the radiator to a shop again. I did it about 14 years ago, and recently had to re-solder the upper joint because it was leaking...
Chances are if the rad needed soldering, then it probably should be cleaned and de-limed, too.
I would like to get a shroud, I understand that they can make the car run cooler by 10-15 degrees; mine hasn't had one since I bought it, and it does get hot here in the summer.
Probably won't get time to get it into the shop for a few weeks, so if I don't post back soon, it's because I'm being worked like a rented mule (lol). Enjoy Memorial Day everyone!