Yep....They were the next thing to go if the other changes didn't fix the problem. Try the Viscious fan first.....then swap the WP then the pulleys. That Viscious fan pulls a S-load of air. I also run an aluminum 1" 2 row crossflow radiator.
Can you tell me how big that fan is? As from the top of the radiator to the bottom of the radiator. I would hate to buy it and it not fit in the shroud.