Co-worker and myself dissected my bag of Columbian from Cafe Grumpys at work today. We brewed 4 cups on the V60 until we found the magic combo:

6 grind on a ditting

12 oz water (not including prewet)

26.5 g of coffee

2:45 brewtime (including a 32 second prewet)

All the cups except for the last had a nasty burnt toast flavor/ aftertaste that kept dominating the softer notes. We made the grind a little coarser, did a faster prewet and poured quickly to highlight the sweetness. Result was a nutty sweet/ maple candy deliciousness. Smallest bit of acidity that falls away to more sweetness. A lovely cup indeed.