[2022] Grinding is my anti-fun it seems. Meanwhile advice on carriers requested.

T4 CVs are very 'basic' - they mostly serve for getting players familiar with the essential mechanics before getting into the higher tiers. CVs in general also suffer a bit in co-op, where games are generally extremely short; carriers work better over extended matches. If you have the FXP saved up, it would save a lot of pain to skip the T4s but T6 may still feel a bit painful.