Ktinga or D7 whatever name you prefer, actually have a lot of firepower on those disruptors, since those weapons do more damage than phasers at the cost of speed and aiming.
mod wise, the D7 is using the same weaponry of the series and it will actually hit very hard and often kill constitution class or lesser ships despite not having so many turrets.
but right now i gotta first table all the other klingon starships and then see if i have to forcibly use creative ideas to balance said ships.
Star trek never matches with itself to be honest, scale wise, tech wise etc etc is a ****ing mess, thats why i have been sticking to canon sources for balance.