when i break compressed gravel with the compressed stone hammer nothing drops, the one probe tells me that a pickaxe is recommended tool for the job it works perfectly fine with compressed cobblestone but not compressed gravel and compressed sand

i just tested and it seems that ex compressum compressed hammers dont work with ex compressum compressed items only extra utils compressed items

Check that they're enabled in the config/ExCompressum/CompressedHammer.json. If they are and it's still not working, post that file on pastebin and link it here.