HoH vs KC5 (vs Twilight Perion)

Unfortunately your 3rd grade math is very wrong. you aren't accounting for the party split when you have a full party.

I'll skip the whole formula, but if 1 golem is 255000 Exp, then a full party of lvl 200 characters with 1HS and only 1 person killing gets the following -
Attacker - 127500 base with 165750 party bonus, total = 293,250
Leechers (5) - 51000 base with 66300 party bonus, total = 117,300

The 20% party play really sucks.

The same party in SH killing a Adv Knight E -
Attacker - 62336 base with 174541 party bonus, total = 236,877
leechers - 24934 base with 69815 bonus, total = 94,749

so its isnt much better,and the math isnt for 3rd graders,we should at least count the HP:EXP ratio