If I don't have very many spins, I only bet on the numbers that have hit the most within the sector or let the number of times each number has hit determine the amount to bet on each number within the section.

Wouldnt it be way too agressive way of betting? I find it much better to collect a bit more spins and correlate amount per number with edge % that most promicing numbers show. like... find common devisor for edge % ... so number with 10% get 1 chip and number with 20% get 2 chips... or something along these lines.