only XL-6

I hope it's not forbidden to play with a modified ruleset (with a rebuilt library) by mutual agreement?

Any changes are allowed by mutual agreement, provided that HL+U is played.
I will mention this in the first post.

Added 3 minutes later

I also don't understand why there are only 3 templates. If you don't want to play 8mm6a, let it be Russel Mix. And where is 8xm8b?

What is the fundamental difference between 8xm8b and a? I don't like the concept of this template (as well as 8mm6), so I decided not to include it this year. We've been playing with them for 5 years. Why not try something different this time?