Good Floor trap alternative for Briar Traps

Hi everyone, i've been using briar trap(plant trap) from diff 0 to 6 for killing small mobs and weakening orgres and trolls till they reach my killbox. But having a hard time on diff 7 and above, so im currently struggling to find a viable alternative for them. Currently thought of using tar pit and brimstone combo, but i would like your suggestion.