Congrats on your new headphones!
I have the Clear OG like you do, and it is a truly excellent headphone, especially at the price. I’ve had mine about 4 years, and still use them regularly. They scale up with better gear quite well, so if you upgrade your amp at some point you will notice the difference.
I know you are running balanced right now, and the Jot 2 is an excellent amp (I’ve had one). You could also consider a Lyr+ though, it’s very powerful and you can shape the sound if you use it as a hybrid tube amp. The Nitsch Pietus Maximus also makes a great pairing with the Clear, and has more than enough power for many headphones, including your Sundara. The HD650 (or any 5xx/6xx series) sounds fantastic with the Pietus as well.
If you try pad rolling with the Clear, I like the ZMF pads for Focal as an alternative to the Dekoni ones, some of which are excellent. The ZMF pads (perforated lambskin) are a bit thicker, and give them a slight bass boost, as well as expand the perceived headstage a bit. They’re very comfy too.
Have fun, and happy listening!