I have 8 torrents seeding. I have 10 torrents on standby seed. Nobody is downloading the seeds. I am sure that some people are interested to download the files currently on standby. However, it seems that Tixati does not check if people want to download the standby seeds.

What settings do I have to change such that seeding torrents are conform demand?

Tixati is a great program but unfortunately it lacks this feature. The only way to help when queue stalls is to manually reorder it or to put torrents with no activity on constant seeding. I think some kind of smart queue should be added.