I would not expect Battleship Hime to be able to overpower the likes of Grimlock.
Either this one is of the Elite or higher class or maybe Grimlock isn't as powerful as he makes himself out to be.
Think about Concept. Ship girls are smaller version of Warships as they has might of warships in them as well as Abyssals , but Hime class is even more they may have a might of whole fleet or even whole naval base in their own. Think about how many horsepower they has (In anime Ooi(That is only CLT) throw Abyssal DD)
Transformer always overpower warship because their high mobility but have high destruction force but if their enemy are same size but still hold power of warship it is difference story
IN doujinshi Power scale is base on Artist so shipgirld may look little weak but in my point of view Grimlock can fight BBHime and Survive 16inch Triple cannon in pointblank range is good enough for me(and he will oneshot her in next few page lol)
CrishStop making us suffer~~~Sink...Sink...Stop making us...Crick