I just pull no more than an album at a time from people usually. spread it out, come back the next day etc. If you aren’t sure, use the chat function and ask them if they are OK with you queuing up more than a couple of full albums at a time.
I share freely, no restrictions other than bandwidth cap and use a round robin to allocate upload slots to people, so if someone does queue up a hundred gigs of flacs from me (in my library that can be a single artist) it doesn’t block everyone else for a week.