We decided to be careful with carbonating this batch of soda and carbonate it twice, as the last soda we made (incredibly spicy ginger beer) while incredibly tasty and spicy enough to satisfy both our ginger-fiending palates, was not quite carbonated enough.
We carbonated it twice (once before going to bed, and once more in the morning) before trying it.
The results:
nice balance between the mild burn of the chille and the citrus flavor of the grapefruit - incredibly refreshing
perhaps still too foamy... and additional tasters are needed before we launch (we'll be actively recruiting tasters... any volunteers??)