While the VIIb and up was regarded as very nimble and effecient boat, the IX's were, at least in Donitz's mind, a very cumbersome, akward boat. In game though, I feel while they may maneuver a little slower, the extra ammo and fuel is a huge bonus.
Just stack up the renown, and when you can afford one without killing your renown total (you'll want to outfit the new boat!), pick one up. 10k+ should do it. You should earn plenty in time for Drumbeat.
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Luck is a residue of Design.
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