Ostend last seems to have left aside her imposing game and is more professional in dealing with her games, so 4 under2.5 in her 5 last seems to have an issue in the attack (only 1 from 6 last scored over 2 times). Also, the absence of Copa Afrika's best player, Moussa (17 / 8), was also a big part of the game, giving it the unpredictability when it was needed.
On the other hand we have a Charleroi who is a "knit" team and faces away from home with great care. Today, 3 may have a good midfielder absenteeism but on the basis of what we read, we expect the technician to put more weight on defense because of that. It also comes from Under2.5 in 4 / 5 its last.
If we take into account that this is a racing game, Under2.5 should be offered at a lower price than in underdog 1.95.