Friend, either your plant has some weird genetic flaw or you did something very wrong.
You'r conditions sounds optimal.
It is possible that you just got a runt, but rule out the other options before you decide thats the case.
Check manualy that the lighs are on 12 hours and off 12 hours. Get in the room when it lights up and when it shuts down.
During the dark time check a few times to see if it doesn't turn on for some reason.
Your plant SHOWS flowering, but not as expected for a 35 days flowering plant. If the lights are fine wait a week to see if it does better.
Your plant looks like mine after 4-5 days in flowering. Not to brag. So when you check other peoples journals in a week to see how your doing, check how it looks at day 11-12.
Beside that, If I recall correctly, swiss cheese is pretty much a sativa. Some sativa's requier a 11\13 light cicle to stimulate flowering. They finish under 12\12, but not as well.
You should email Nirvana and ask them about that.
Anyhow, if its not enviromental I'd toss away that genetics after this run and get something new for your next run.