Two weeks effort and I've redone everything after the 2nd chest and killed the 5 zealots lost in WIP7 when opening the final door. 3rd bonus chest (5:58) is redone, again matching my 411,770 point video's 42 kills.
"This is the third time we have destroyed the 3rd chest, and we have become exceedingly efficient at it".
If I get all 348 kills (still not guaranteed) final score will be 415100 with completed bonus chests of 40, 41 & 42.

This is a Tool Assisted Speedrun/Superplay (TAS).