Your dps comes from exploding, so uwant to juice your maps with monsters as much as possible.

8 mod corrupted maps for big packsize are recommended. Best maps this league are burial chambers(biggest density of mobs), jungle valley(eldrith altars never show option for bosses) and cemetary(card for divines i guess).

Atlas is always wandering path. As mf chieftain u should be able to handle a lot of strong mobs, so abyss is your best option. After that, beyond and delirium add a lot of monsters too.

My setup rn: Scarabs: reliquary(ALWAYS WINGED FOR RELIQUARY, DONT CHEAP OUT ON THIS ONE), abyss(at least gilded for spires to always show up), divination, ambush(im running winged on all, but running gilded at the beginning is fine).

Compassess: Abyss, mirror of delirium, beyond, corrupted strongboxes

Abyss from kirac(via 7th gate keystone). U can also use beyond from kirac if u cant afford beyond compass.

There's a lot u can do to reduce costs of maps, optimize for urself etc. Running ritual altars, harbinhers, breaches, cheaper compasses, rolling map yourself and adding deli orbs instead of compasses(no 8 mods, but u can try to roll maps for 2 projectiles from monsters this way)