[mothered]

but even if they aren't, others may have accounts from those IPs that can link me. Should I just use a VPN anyway?

Have you tried to simply connect to the Tor network? There's 3 relays before It reaches the exit node, destination server.

Alternatively, you can setup "proxy chaining" which does just that- chains/links two or more proxies to reach the website you're after. Without documenting a complete tutorial (I don't the time), this Is the basics of proxy chaining:

End user -----> Proxy A -----> Proxy B -----> Proxy C -----> Proxy D -----> Proxy E -----> Destination Website.

Basically, there's no limit as to how many proxies you can use but the more you link, the more susceptible It Is to failure. In other words, If "one" proxy Is not working within the chain, the entire chain will not function. So It's Imperative for each proxy to be fully functional.
The moral to this Is, It's highly unlikely another user will have the exact same chain as yours.