Would love to see how number 6 turns out, haha!

Also will add there is nothing wrong with slim fans BUT you will be spending a sh!t load of money to get one that will flow what the stock ones did. Pusher fans are a nice option too but it seems your issue is during speed so that peace of medal removed should help a lot.

Also no A/C is always good, haha. You could always go 3 core rad too, but I am not a fan of this option because you may be hiding an issue you could fix for less money.