I like the triangles, subtly the lighter points push my eye inward to those charming blocks. This is pretty!
In my opinion (and if I well understood what you mean) I would add a simple frame that would emphasize the beautiful patchwork that you made and balance the busy pattern.
I like the triangles as you placed them. Less is more so I don't think you need another row. Enough interest in the colour. Lovely
I too like it the way you have planned it. The triangles are just right to give it a soft subtle look to the piece.