The thing is, the last biggest one's output is 180 per second and my best try is to use a chest at the output and three stack inserters around the chest and they still do not cover the need. Any suggestions? Maybe some amazing mods that can help? Thanks for your time!

if you want you can use Miniloader to unload a full belt of stuff

if you want to unload the full 180+productivity I suggest you one of my mod (random utilities) with the basic belt tier

(there're plenty of mod to extract more but i want to share mine XD)

if you want join my discord https://discord.com/invite/753wmGJ

u can use it to load directly into a train wagon, but other than that miniloaders and maybe faster belts mods are great