Leandros,
I am sorry to bother you about this,but can you just tell me what version you play the game in,some of the major mods you use,realism settings,and of course the date you are currently playing?
The only reason I am asking is because of those titanic tonnage scores (compared to the measly 5000 tonnes or so in my current patrol) you present,not to mention the apparent relative ease you are dispatching major British warships
I am not discriminating you my friend,but in real life no single UBoat,in fact no ship (except the Bismarck,man for man) could challenge the might of British warships with such relative ease or comfort,unless they had serious issues upstairs
The only time British (English to be exact) warships ever faced such a problem against other warships was against the Spanish armada,and even then they got wasted in the end.
The most I ever sunk EVER in one patrol was no more than 30.000 tonnes if I remember,and only ever 2 destroyers.
Thankyou.