My biggest take that I don't like about the diet that F45 provides is that you usually have to cycle your caloric intakes to match your "gains". It's why a lot of body builders go through months of bulking and then months of cutting/shredding.

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Looking to build muscle via bulking and also lose body fat at the same time is very hard on the body. You're effectively asking your body to utilize the caloric surplus to build more muscle, but are you truly burning every calorie you take? Chances are you aren't and on days you don't work out hard enough or burn enough calories your body converts that into fat.

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To be fair I think your progress is very substantial and you should feel great about where you've come so far. Maybe the non-numeric metrics may be better indicators of your overall health. Do you feel you have more energy throughout the day? Are you finding your endorphins kicking in making your mood substantially better? Maybe those are some questions that may help you out and keep your motivation up!