Oh, btw, it's a really good idea to announce the equity percentage outside the spoiler, so that people knew the record they should strive to repeat or beat. Thanks for it!
The smallest nuts-vs-non-nuts equities I've achieved so far are:
4-card Omaha 21.22%
5-card Omaha 6.34%
(For 5-card Omaha equities, ProPokerTools can be used; I'm not aware of any equity calculator for 6-card one, and it has little traffic, so I'm not interested in doing the challenge for it, even though equities can be calculated manually with some effort if desired.)