diet diet diet
you are (probably) losing more calories than others because of your weight vs theirs, you lose a lot more the more you weigh
not sure about the whole AIO sesh and im no expert but if you're going 4-5 times a week I suggest getting a schedule, working basic muscle groups per day - chest, shoulders, back, arms, legs and group abs/cardio in with them pre/post workout, switch it and your exercises up every so often, there are plenty of articles for this
the key 100% to losing fat is your diet. look up the keto diet, i found that one to work relatively well
your best shot is looking elsewhere online, there are 1000s of websites made for this purpose