Generally speaking, bottle bombs are only a problem if you bottle with a large amount of unfermented sugars still in solution. (Either by incomplete primary fermentation or a large amount of crystal/caramel malts which will break down over time) If you have a saison that is below 1.010, you won't have issues bottling even to the 3.5 vols. 3.5 vols is only 50 psi at 50 C. I know I'm mixing imperial and metric, sue me, I'm American
Bottom line, with the level of fermentation that you've achieved, I wouldn't worry about it. Carb away!