40%
Put similar levels on the same court - comfortable, like-for-like games. Takes priority.
40%
Deliberately mix levels on a court (strong + weak per team) for variety. Takes the rest before random.
Ignore levels when choosing the court - pure social variety. Whatever's left over.
✓ Whatever the mix, the two teams on a court are always balanced for a fair game - never two strong players against two weak ones.