Some responses from MY lessons in life only. These may not pertain to you.
1) The bloat you are experiencing "could" simply be due to a simple digestive issue (lack of necessary enzymes/proteases to deal with such high volume protein intake). That's an easy fix w/the addition of (and maybe some betain HCL-debateable) and perhaps some probiotics (more comprehensive/ancillary suppport)
That said, it could also be what I already mentioned as well (acidity/inflammation). Google acid/alkaline diets/lifestyles and you will find a plehtora of research to support my position on the negative cascade of effects from a chronically acidic (high MEAT) diet. Disclaimer: If you also eat a variety of very alkaline foods with each meal like most greens are, you might be able to better balance the acidic environment.
With respect to you going al the way down to 200 overnight - perhaps you should start at 250-275 and see how your body responds? Some do "ok" with higher levels (however, I am not convinced they arent causing other issues internally).
2) With respect to the macro's. That's more of a personal trial and error thingy that Im not sure anyone can advise for your unique situation and needs. Lowering carbs doesnt work for everyone and Im a low carb disciple who has fostered this lifestyle for 10_ years so Im prejudice based on my experiences. Also, macro needs (protein), is one thing I think the individual should assesss as well. Again, I used to eat liek you (thanks to all the wonderful "GURU" advice) and wrecked myself int he process. Live and learn.
Im in my 40's so an old fart now and only do about 2500 k/cal a day on average. Again, 200 grams of protein MAX (lots of BCAA's).
I train 6 days a week in the AM and 6 cardio sessions in the PM (I have a very sedentary desk job so the "cardio" doesnt really count per se as it would for the normal joe).
3) I concur with your sentiment/position regarding going too low in carbs. Two options IMO. Up the BCAA's (pre/peri/post training) as these are effective anticatabolic/muscle-sparing supps. Increase your healthy fats. Some days, I get 250 grams of fats in my diet and stay lean. It's a brain game though because we have been so brainwashed into believing fats make you fat. These days, I get a copious dose of coconut, almonds and macedemia nut oil in my diet. I actually feel "energized" (probably more so from the coconut/MCT's)
I hope some others chime in and offer other/alternative insight as I dont want to see you replicate my regimen as it may/may not not be ideal for you.
Good luck manggg