I continued C1 for the heel.

I kept forgetting to weigh my yarns, so here are all the yarn usage numbers you get

Start
Pink - 30.2 grams
Blue - 35.6 grams

First sock
Toe - blue - 32.3 grams
End of sock -
pink - 21.9 grams
blue - 17.9 grams

Second sock
Toe - pink - 18.7 grams
End of sock -
pink - 4.6 grams
blue - 10.0 grams