Indeed you are correct. Only the weekends saw two flights at Stansted and was no Wednesday service, hence why I got 8 per week. It might have even been less than that outside the peak summer holiday period, as low as 6 per week.
Flights on the weekdays would operate via one or the other. Sometime it was Guernsey via Jersey and other days it was Jersey via Guernsey. A bit of a messy schedule to be honest.
This is near enough a double in their seat capacity at Stansted as they will now operate two separate rotations 7 days a week.