Thralls are stupid. When you farm bosses long enough, you will see that often RNG is a big factor on how long it takes to kill a boss. So I dont know how good balancing weapons can be based on killtime from thralls.
Also the base stats are based on the faction. All from Relic hunters will have high ACC.
@Jim1 made a good wiki entry where you have an overview All combat T4 thralls with stats, sortable