You say game is about realism. New tanks arent added due to lack of specs blah blah blah but you take a 155mm howitzer designed for indirect fire and say “oh we are making you a tank v tank armor now”.
So why in the hell wont you give it a single degree of depression? The howitzer is damn nearly useless unless you’re on perfectly flat ground. You obviously only apply the realism logic to what and how you want so giving this a -5 degree depression is to earth shattering for you?