The simple and only answer is,... you don't. A "Red Book" standard audio CD is uncompressed, 44.1k, 16bit stereo. Period. Audio CDs are not compressed, nor can they be. There is no such thing as a lower compression setting.
You can only fit 80 minutes on a 700 MB CD. You can find 90 minute CDs, they are rare and may not be compatible with all CD players, nevertheless, a 90 minute CD is the only way to fit 84 minutes on an audio CD. There is no other way around this and still have it play on a standard audio CD player.