If you are flying the route all seven days under one flight number, the oversupply limit will be based on twice the Saturday demand number. It might be a 40 pax route but if Saturday demand is estimated at say 28pax, your limit is 56. Considering that you are dealing with a 10pax route, it's probable that Saturday demand is more like 6 or 7pax which would make the limit less than 15 so you are still technically in violation.

If you have enough time on your hands you might want to divide the flight into a 7-day schedule so you can set different seat blocking limits for each day but in general the limit for the worst day won't be so much higher than the best day as to make that worth the effort. It's fastest to just set a limit based on the Saturday number and just remember to update it every year or so as demand increases.