I detangle once a week when if I plan on wearing twists for that particular week, and twice a week if I have my hair out. My hair gets easily matted, like yours, if I leave it out for more than 2-3 days. I think if you're being careful with your detangling process, then the amount of times you detangle in a week shouldn't be an issue.
Type 4, fine/high density, high porosity
Last Relaxer - March '11
BC - August '11
Clarifier - Paul Mitchell Three Low-poos - BoBeam Conditioners - TJ Nourish Spa, CJRM!, Co-Wash - N/A, Leave-Ins - N/A, Moisturizers - Afroveda Coco Latte, QBCTDG, CR Moisture Butter, Sealants/Stylers - Any BASK butters and creams, Jane Carter N&S, QBATB