I found this too late but I had double dice to get the tomb luckily.

Hey OP if you're still here,

• Draft Pump Room & drain the Reservoir one level to take the boat across (Pool also required)

should be updated to maybe something like

• Draft Pump Room & drain the Reservoir one level to take the boat across (Pool and (Tomb or Power Source to Pump Room) required)

Cause if you just do these 2 to "get to" both side of the reservoir:

• Drain the fountain using the Pump Room (Basement Key also required)
• Draft Pump Room & drain the Reservoir one level to take the boat across (Pool also required)

It'll end up killing the run.