With the time you're training (during your feeding window) you shouldn't need to consume BCAAs the same as if you were training early morning, fasted.
Personally, I've done IF for about 4 years now and wouldn't change it for the world. It keeps me lean and has totally changed my thoughts on food and approach to eating.
I love food and eating lots of it, so if I practice IF I can eat larger, but fewer meals in my window. On training days I eat about 3400 cals and then about 2800 on a rest day. When I really dial this in and also carb cycle too, I can get much leaner in a shorter space of time, whilst still maintaining/building a bit of muscle. I never do cardio per se either
I train first thing at 6:30am, drink my BCAAs (xtend or similar with zero cals) with creatine HCL and then continue to fast until 1pm. I then have 2 main meals and a large snack (eggs, cashews and ham usually) during this time, until 9pm; so a 16:8 approach for me.
If I need to lose water weight or a bit of BF really fast then I'll sometimes fast for 20-22 hours on a rest day. Actually, this can be a lot of fun when you're used to it - plenty of water and a couple of black coffees in the am (I don't drink caffeine after 1pm) and by 4/5pm your head is clear, you don't feel hungry and you feel great! Almost a bit high in a way
Using the above approach I've found that I can consistently have "diet-free" weekends, as long as I at least do a 12:12 fast:feed on Saturday/Sunday