I recently saw "Rampage" from 2009. Its basically a movie where a spree shooter is portrayed as the good guy/anti-hero. Several parts gave me that pit in your stomach, teeth gritting uncomfortable moment. I really hated it. Although I'm not surprised there are sequals I am disappointed and will not be watching them.
Troma of course a mixed bag but i have a big soft spot for more or less anything of theirs, agree T&J high up the ranking
cheers for The Surrender, haven't come across that, i'll get it to add to Bring Her Back already on the backlog
When Evil Lurks is excellent, very high stakes, noone safe. And even though ST wasn't much cop the same guy made Fried Barry before that which i think you might like