To help with the trimming, I cut a wave from paper and taped it to the wrong side of my 9.5" square Omnigrid ruler. I can place the ruler on my strips with the paper wave lined up with a curved seam. This ensures the ruler is centered on the strip before I trim from each side.
This made the trimming easy. I started at the top of a strip with the paper curve aligned with one of my curved seams, trimmed along each side, then repositioned the ruler further along and cut again. I repeated this the length of each wave strip.
The result is a much cleaner edge on each strip. I think this will make it easier to sew the strips together into the quilt top.