Haha! You wouldn't be the first to not have found the funky room. Pacha has two others rooms, the funky room and the global room (and there is also the roof terrace, but they don't play music there) The Funky Room is small but some of the best times I have had on the island in there. Great atmosphere! It is up the stairs at the back and then through a small door, you will find it!
If it is the following Sunday, the 5th July, Dixon is supporting. Think that night would be a good choice for you.
FMIF to be honest would be the worst night to go to Pacha, too full and people there for 'the experience' and not for the music. Solomun would be very different and you will also now know about the funky room!