I have installed 3.2 roms and Im using Workbench 3.2, as I understand it supports large drives.
I’m taking it you are using the FastFilesystem? Or PFS3?
What are the following in HDToolBox?
File System Block Size
Mask
MaxTransfer
If MaxTransfer = 0x0FFFF or similar. Then try changing this to 0x1FE00.