Where to level with Frigate ship?

[Xal]

I'm level 10 sailing and I've been destroying lvl 6-10 Bulwarks and Greyhounds off Devil's Anvil with my Frigate ship. Can anyone recommend another place I can level up at with slightly higher ships please? I can solo flag ship kingshippers but I'd rather not board them because the mobs are most often red to me and my toon is lvl 13 so I'm looking for a spot for non flagged Kingfishers or any similar difficult ships I can take out with a crew of usually no more than 2/3 others besides myself. Any tips would be greatly appreciated, thank you.