You and I seem to be similar in body measurements so I'll list my stats and info:
BF% based on handheld omron: 15%
I'm on a M-W-F split. Off days I do absolutely nothing except occasionally walk to the grocery store. Saturday and Sunday I sleep.
On workout days, my calories are between 1800-2000. On non workout days, they can be as low as 500-1200. Workout days I'm more carbs and less fat. Carbs are between 300g-600g on those days. Non workout days anything goes but usually higher fat. moderate to slightly elevated protein all days. Last summer I was 245 and couldn't see my feet, 38" waist. Now I float between 204-206, 34" waist and have a moderately visible 4 pack. I do a modified IF where almost every day, I have a 4-5 hour eating window (19-20 hours fasted) and probably once or twice a month, I'll pick a Sunday and not eat at all. I workout fasted.
When I first started MDA, my calories were similar to your numbers using various calculators though mostly low carb. That got me down to 215-220 with cardio and crossfit style workouts. I stalled for about 6 months. Then I started cutting calories and focused on strength training and ditched cardio. The reduction in calories doesn't seem to have affected my strength or "muscle size". My deadlift last summer @ 245lbs was 135lbs x 5. Last monday, my deadlift is 310lbs x 5 @ 204lbs. Not impressive by power to weight ratio standards but impressive to me considering what I had to start with.
I would be very suprised if you actually gained weight by consuming less calories. So my advice would be to cut your calories.
Currently dabbling in: IF, leangains, Starting Strength, 5/3/1