What is the rationale for national differences in turret hits leading to explosions?

I am new to GQ3 and first few encounters between opposing ships has led to an extraordinary high number of ships detonating.

I have noticed that the French ships are slated to blow up 33% of the time after a single turret hit (which seems extraordinarily high), most other nations at 25% (including the RN, which seems to fly in the face of their wartime record) while the German and US ships are rated at 1/12 chance which seems far more realistic.

I cannot find any information on what was fundamentally different between the various nation's turret and magazine layouts that would suggest a fundamental difference in risk.

Do the game designers have any information on this?