Its possible - I'm 5'10" 212 and Just made 10% BF (at 38 years old I can see my abs for the first time ever) I was 278 and 38% body fat in July. It was a long journey for me to kick the soda but it helped kill my sweet tooth which ended my my sweet food binges. I went from a about 20 cans of dew to the same amount of diet - then started cutting it out slowly till I was drinking mostly water and only having a few diet sodas a day, finally I got used to drinking black coffee and now have 2-3 cups of that and water only. About a month after that and I didn't even want dark chocolate. I think the artificial sweeteners, while calorie free and not necessarily insulin spiking, keep the palate conditioned for sweets. While the weight loss was great I really came to this WOE because 20+ cans of soda and a bunch of other sweets lead to - shock - surprise - type II diabetes and after being shown how to check my numb feet to make sure I wasn't cut and being told that if I did get cut and didn't feel it, I would develop an infection and loose the foot was a great help in inspiring to change my ways.
As for the hormonal thing, HGH seems to rise in absence of insulin - so primal eating and IF are good for spiking it and speeding recovery. Yet another reason to kill your sweet tooth. I've heard coffee can raise insulin and plan to remove it next from my diet (still big on caffeine now though) Once your body is adapted to burning fat instead of carbs you have all the stored energy in your body fat to use instead of the up and down energy from consuming carbs - this would explain higher energy levels.
Maintaining muscle mass while losing weight on this WOE was easy for me - I actually gained muscle mass. I think with 2-3x a week strength training and low cardio, maintaining mass muscle shouldn't be too hard for ya. If your into High Intensity Training (you already stated that you have enough experience) I would look into DC style rest pause training - pretty sure this is how I gained muscle while losing fat, that and maybe a bit of retraining or muscle memory effect - all in all I am still surprised at how much muscle I was able to gain last year.
lets see - 233 at 18% is around 41 pounds of fat or close to 190 pounds of lean mass - so 210 at 10% should be doable for you
My brother is a body builder but at 5'8" only weighs 170 at 8% BF - I'm former power lifter (haven't competed in years but still base my training on the big lifts - Wendler's 5/3/1 + High Intensity Training accessory work - DC style) The big reason for our 40 pound weight difference is because of our training. We have the same size upper arms though at 170 and focusing on biceps his LOOK much larger. Using the big compound movements with heavy weight tends to build more density. Also a lot of the weight is in my legs - after building my squats and pulls back up I have cartoon big legs - 33" inch waist and 28" thighs.(finding clothes isn't fun - 33" waist carpenter jeans fit like other peoples slim leg jeans - cant wait for shorts weather - 10% is making the serrations in my legs start to show)
patience - I image you didn't get up in weight over a few weeks, I started much heavier than you and looking back, 9 months to get down to 10% doesn't seem like long at all now - heck before I found this WOE I never thought it would even be possible. Stick with the primal WOE, train hard and you will get down to to your body fat goal - I wouldn't worry to much about the weight - I freaked out a bit when I dropped below my old comp weight (220) but seeing my abs makes it worth it.
"First say to yourself what you would be; and then do what you have to do" - Epictetus