I was going to recommend another coolant system flush specifically a good backflush, but you beat me to it. I would do that first as a last resort before replacing or refurbing the rad. The other thing I wanted to mention is to visually check flow through the radiator. With warm or cool engine, remove the radiator cap, start engine and let it come up to temperature. When the t-stat opens you should be able to see coolant flow.

Well, first I will check for debris and see if I can't repair some of the fin damage toward the lower part of the radiator. If that doesn't do it, I'll try the backflush idea. If that doesn't work, it may be off to the junk yard for me.

Good Luck! Let us know how it turns out.

My 93SSEi runs about 20° hotter than my 95 SLE/SC.

Having ruled nearly everything else out, I believe my radiator core is crudding up on the SSEi. I'll be doing this soon as well.