Kokomala

It takes 60-90 mins to clear a sister. Why not have holokeys drop per stab (i.e. 1 holokey x rank)?

XP not carrying over is more than fine. With the exp values from invigorations being what they are, in 5 weeks this will be a non-issue - nothing is make or break or a "must have it now" to the point where not getting it in 2 weeks will break your gaming experience, nor will someone with frames to go getting it 2 weeks earlier impact your gameplay either - you are most likely more progressed in this game overall than those who are currently working through it. If you have that much of a FOMO reaction, then by all means use the infuse/feed loop with resources to get there. You have that choice.