Why are you using iron and fire arrows in plains ? Having frost and needle that are best for any type of fuling
And nope , 2* berserkers are fine , they are literally mid bosses and have the same weakness as a normal : soooo slow to attack , more than a troll
And nope man , 2* fuling berserk can hit for 200-240 so only can blocked with some luck with blockit at lvl 100 ( bm shield lvl 3 can parry 203 at that lvl ) , so you must use roll to evade their slow attacks
These gigants have 2400 hp so only can be killed with BM sword or atgeir combos , or using a lot of needle or frost arrows