I have been very happy with Ocooch in all I have used, but there is something in general that you need to pay attention to. If at any time you see like a candle flame where it is cutting It will not be cutting through at that point. If you slow it down it will just flame more and still not cut. Ocooch Mahogany (.25) is the best of any of the mahogany I have used but mahogany is one of the easiest to over flame of all woods I have used. If I am getting flames I do not slow down but increase power or make more passes. If I still cannot cut through (and mahogany is the only case I have had to do this) and I can see the cut almost cuttting through I have flipped the wood over and cut (very lightly) from the other side after very careful alignment and a test at 1 power that will show where the cut will be.
Still you need to test any piece pf wood you are having trouble with as small as possible test. This is one I made specifically for that mahogany…