Grinding RP for Seigfried, working through the IJN DD line to Haragumo (best efficieincy for RP gain) In one day got two huger results and a whole lot of great ones (another 2x Kraken besides these)
There's some monster boats in this line. Hatsuharu, Kitakze, Minekaze and Akizuki are all capable of huge games with over 5 kills, double strikes, dev strikes and a whole lot of smiles per mile.
If you're looking to grind for Seigfried, best recommendation is reset Haragumo line :)
