I don't have any true forms (except for Merc but its not so great so I don't even count it), most of my normal cats are at 20 +5 or 6, and most of my rares/ specials are at level 20. Im struggling with the ItF levels after The Great Abyss, and I'm stuck on Sea of Tuna for SoL. I only have two ubers, being Wargod Imagawa and Coppermine. My common line-up is Necromancer, Paris, Masai, Butterfly, and Hacker in terms of standard levels. I have Solar, Power Saw, and Castaway for ItF. Where should I go from here?
I'd recommend to do early SoL stages with two-star or three-star ratings if you haven't already. Use the XP you gain to level up your units, and when you hit rank 1200 grind catfruit and true form important cats like Mer-Cat to Cameraman, Surfer to Seafarer, Bishop to Sanzo, ect. For Sea of Tuna whatever stage you're stuck on, i'd just simply suggest changing some things in your general lineup like removing masai (Way too expensive for a meatshield, doesn't have 100% survive) removing hacker (Low DPS, pretty impractical on stages without master a) removing necromancer (Only use in stages with floating enemies) and adding it units like dragon, valkyrie, and bahamut if you haven't already. Also treasure ofc, unbelievably important to get the alien aqua/plasma crystals to 100%.
You don't really need to cheese dark souls - Simply spam a couple wall cats at the beginning and stack bahamut, don't spawn anything other than bahamut and wall cat. When you have 2-3 bahamuts stacked up simply start spamming LD units like vaulter and nymph, and 4 meatshields (Samba, Macho, Wall, and Catburger) with other generalist attackers like Cameraman, Castaway and Paris to add damage to the boss. Imagawa should work well here too.