no there is no setting to avoid short video notifications. i would recommend that you unsubscribe to a channel or at least opt out of notifications. if you continue to watch the channel's video, the channel will still show up on your youtube feed. if you watch a particular channel more often, that channel should always show up first. i subscribe to so many channels that i just keep youtube's overall notifications turned off. i just open youtube and the channels i watch most will show up first. i go on youtube quite regularly so i do not need to be notified, especially if you have channels that are consistent with when they upload their videos.