If I have multiple torrents going, I always have to select the next torrent and manually force announce to get the next one started

Sometimes they start but its after a long period of time

Is there a way to force reannounce automatically/more often?

I've noticed this too, especially if Tixati is starved for outgoing connections on peers (setting). You tell that this happens to trackers too? As far as I understood, the most recent versions improved a little bit in this regard. Although other clients are still "quicker" to start. I remember reading old utorrent was infamously aggressive at connections and reconnections.