Patch Available - GMS 1.50

Ancient Golem: HP: 49,000,000 → 13,056,000, EXP: 123,308 → 60,857
Ancient Dark Golem: HP: 50,000,000 → 13,502,400, EXP: 127,733 → 62,650
Ancient Mixed Golem: HP: 51,000,000 → 13,955,200, EXP: 130,514 → 64,640

Ok, so here's the exp comparison using a party of 6 all at lvl 200 (1 attacker and 5 leechers) at Ancient Mixed Golems with NO HS.

Pre patch (20% party zone):
Attacker - 43505 base + 56556 party = 100061 Total Exp per golem
Leechers - 17402 base + 22623 party = 40025 Total Exp per golem

After patch (no party zone, only new party formula):
Attacker - 21547 Base + 37707 party = 59254 Total Exp per golem
Leechers - 8619 Base + 15083 party = 23702 Total Exp per golem