This was interesting. I’ve written triolets before and I ran into the same issue this time. One feels the repeated lines would be more affecting if the poem were sung; on the page, they can seem a bit like dead wood. Perhaps my approach is too straightforward?
At any rate, I decided to write several triolets and play with different approaches. One approach is simple and uncomplicated. It’s lyrical because as I said, this kind of thing feels like it should be sung. The second approach involves the repeated lines changing slightly each time as the poem progresses, responding to the development of the theme. The third is to keep the repeated words the same, but to intimate new meanings to the reader by way of the intervening lines. I imagine this is seen as the ideal way to approach this kind of poem. But it seems more graceful when taking this approach to take out the middle A and replace it with an a, so that when the lines recur they feel like a surprise and you get to find out just how much your understanding of the lines has changed.
None of this is prescriptive. It’s just how I played with the challenge from the platform of my own abilities, which tend not to be on the subtle side.
I look forward to seeing more triolets!