Ugh sorry to hear your fan came damaged. :/
TBH I didn't think the evga fan that comes with the SC2 is as bad as people say. I could barely hear it.
I replaced it anyway with a corsair ML120. Pretty happy with this setup. Both my aorus and the sc2 sit at temps in the mid 50s while mining. I haven't tried any games yet. I suspect the sc2 will run warmer in-game vs. mining. Looking forward to doing a little testing.
As for static pressure, the ML120 is much better than the stock fan. Stock fan is a 5$ fan, ML120 is a 20$ fan. A have two ML120 and one feels the air beeing pushed, but I don't want them near me since they are very noisy at high rpm. However, I don't think the ML120 needs very high rpm to cool the radiator. Probably the ML120, or some Noctuas, is one the best solutions.
However, I must say that this fan issue is damaging in a stupid way to EVGA. The FTW3 is really a fantastic piece of engineering. I own as well a Waterforce, Strix OC, MSI Trio, all of them very good serving different functions, and I've been impressed with the ftw3. You can exchange the radiator fan easily, not like other water cooled cards, where you don't have an option to do it directly. For a small amount the warranty is extended to 5 years. A very good product spoiled by a bad parternship with a fan maker.