Trail is actually working for you, I just tested.
But it stops voting when their voting power is less than 80%. So trail vote can be hit or miss... when everybody has enough voting power, you will get votes from everybody but when they don't have enough power, you won't get votes from trail... so its better to delegate more BP.
Hi, @tomoyan, I didn't manually upvote anyone, but my voting power has dropped to 53%; what advice do you have for me now?
Your BP is not that high so few big votes could affect your power but it will recover in time since you haven't voted anyone last 24 hours