When you do the overlap if you have excess on both pieces ... you can match the two pairs and save on the off cuts and waste.
For me I'd start with the FQs as is and lay on top of each other. both facing up. Then take the top left and bottom right as a pair to sew ... and the top right and bottom left as another pair. Then move onwards to another FQ set. And then eventually match up sets that are sewn already for a second wave and a new set of colours mixed/
Tedious ... but it can be very effective!