I have had to bend a few staff-like finecast pieces myself and something that worked just fine for me was to use hot water and nothing else.
Hot water, about 60 degrees celsius, in a bowl or on a plate. Dip the staff, just as much of it that needs bending so as to not get too much of it soft.
Then bend it to shape and hold it that way until it cools (at those degrees, the staff will cool very fast, no need for cool water really, but it wont hurt to use that as well)
It may not stay straight but just keep repeating the same process and you will reshape it in no time
Finecast is pretty elastic, which is why you cant just bend it without heat, and is also why it often goes back to the way it "remembers" how it looked.
But everytime you heat and cool it, you rearrange the molecules slightly until it will remember a different shape.
Good Luck!