I use Aliucord which by default removes many of the associated Discord trackers.

It should be noted that all 3rd party apps are against Discord TOS. No one has ever been banned for these clients as far as I know, but it is possible that they could start banning in the future.

Is there a way to run it in hard mode since it’s based off of uBlock?

That’s normal with VPNs. You are sharing bandwidth with other users when you use it, so you lose speed.