>>535084239
Use an online map tracker to find all sonance caskets and blobflies for your 1st pass.
Then use sonance beacon/radar for the remaining ones you missed during your 2nd pass so you won't have to recheck all areas again.
Chests can be tracked using the loot mapper tool which you get the license from delivering sonance caskets.
Beware of Desorock Highland. You literally need to 100% everything in that area to get the 100%.