I've finally got my fully phased QOTF Raider cyclone character up and running. Currently delving I can get about 20 raw chaos and 40+ fossils per hour. I usually just look for tasty biomes, but I mostly fart around the monster lvl 55ish-50ish areas. The amount of chaos from wealths are ridiculous. They will nerf this. I'm blowing 30-50 chaos on items I don't even need just to see what I can roll because I know I can make it back in an hour or two.
Interestingly, my Con Path Chieftan is nearly as fast as my Raider with the massive HP regen from endurance charges. I use Kaom's Roots and just leap/con path around instead of just running while phased everywhere. Pretty close to the same and definitely better for going deeper. But if I'm just fucking around in low delves I'll 100% use my Raider as she also has Vaal Cyclone so when I get to the node I just hit that twice and it does all the killing for me!
MF is either the worst idea ever for this league or the best. On one hand, the amount of loot you get and currency from chests (not effected by IIQ/IIR) is absurd. MF builds though good aren't optimized like actual speed clear builds. On the other hand, if you're in a party and at depth 270+ you can probably get some absurd loot. The problem with this is it requires group play which requires cart hugging.
Overall I'd say a high mobility, high regen char is going to be the best if you're not just going as deep as you can.