Do not make too many changes at once. Get the Ellipse XS with a 5/8 and see how that feels compared to what you had in your last skate. I'd probably have that put on your current steel before buying new as well, or buy a cheap used set on Sideline Swap or Ebay just to test with. Even now, you made two pretty big changes - steel size and not lacing the top eyelet (not to mention much stiffer skates in a correct size with a different flex and wrap profile and pitch to your last) - and you can't really pinpoint which of them made the improvement in your game. It's possible all the increased agility was due to the better forward flex, and you'd be fine by just having the holders on the skates changed back to your 263s. I would suggest not adding a third variable by changing the profile (and then a fourth by changing the hollow), before you get a clear idea what the first two variables did. Go back and try skating on the 246 with the old way of lacing a few times to see if it was the flexion or just getting used to the steel that made the difference. Then make the next change you think will help based on the information you gather - be it a different profile or a shallower hollow. Do not rush this, there's no reason to. I know you want to see even more improvements right away, but doing things without fully testing what you have and giving time to adjust may cause bad decisions and you could end up with something that isn't the best for you.
I just went through this. I am going to need new steel soon, so I sent all my old steel to be profiled differently - Quad 2, Ellipse 1, and Quad 1. I had been skating on the Quad 2 for a while and was pretty happy, but the steel is pretty worn down so I switched to old runners that had a Quad 1 on them and more steel. I found a huge increase in agility that I liked a lot, but after a few games I found I had lost accelleration and top speed. Players were skating with me or catching me from behind when they weren't before. Putting the Quad 2 steel back on was awful and I lost pretty much all agility and was even tripping over my toes. So I went on a search to find the best profile to give me what I want. Putting the Ellipse 1 on was like an epiphany. It was completely natural to me. If I would have made a decision right then, it would 100% be the Ellipse 1. But then after a few skates, i noticed that I was still not getting the speed I wanted. So to be true to the process, I put back on the Quad 2 and gave myself the time to test it adequately. The first skate was rough, I felt like it was long and I was off balance. I had to go and put the Ellipse back on mid-skate. But I stuck with the Quad 2 and it turns out it's better for me. I'm faster and more efficient, and I don't feel less agile anymore. It turns out the profile wasn't done correctly before - the toe wasn't blended enough plus it had the full 20mm of pitch. That's why I kept tripping over my toes and had lost all the agility. But when I had them done this time, it was much better (and it's still a little longer than normal because there wasn't enough steel in the toe to blend). I think on new Flare steel and the complete toe blending it will be what I was looking for. If I hadn't stuck to the program, I would have made a bad decision and ended up with a profile that felt good but didn't really fix the issues.