Cutting now would make you look more like The Machinist than you already do, so no, I'd say it's not the right option.
Over 35% is pretty much obese. What did you weigh at that point?
Also, how are you calculating "above 15%" and "over 35%"? Were you actually measured with calipers by a trainer? Most bodyfat readings are inaccurate and/or inconsistent, so it's better to go by general looks, tracking actual measurements (waists, arms, legs, etc.), and photos.
What exactly are your goals?
Anyhow, whatever you've been doing the last year and a half did not promote muscle growth or preservation, so it wasn't a very efficient plan. You lost some serious weight, which is definitely good, but that you ended up "skinny fat" means you lost (or didn't actually build) a lot of muscle along the way. Expect to change how you're eating and how you're training to see even better results.
No. You need to focus on gaining muscular bodyweight now. Absolutely nothing positive will come from trying to "cut" from where you currently are.
You're so underweight right now, you could probably gain 4 or 5 pounds a month for the first few months. As long as your training and nutrition are dialed in, it should be mostly muscular bodyweight.
Estimate, shmestimate. What are you actually lifting?
What does your weekly training plan look like (the days, exercises, sets, and reps)/