@Aestet Yes. You definitely DON'T want split tunnelling. Or at least, you don't want qB outside of it. It is, as you say, the same as not using it.
You'd use split tunnelling where you specifically don't want something to go through the VPN. Some websites won't accept VPN traffic, so you can have one browser that uses split tunnelling that you use specifically to access those websites.
For now, so as not to confuse things, I'#d just say "forget split tunnelling". One thing that might be worth trying, which the AI did mention to me, is changing the server location. I was chatting to someone using Torguard's VPN, and that wouldn't allow torrenting on US servers. When he changed it to one in Canada, it started straight away.